D3 Line Chart With Points

In this tutorial, we saw how to get started with creating a simple multi-line chart using D3. Note that both 'colour' and 'size' properties of a marker are bound to data. All of the concepts that we have learned till now are used as modules for creating a visualization in D3. The API lets you produce interactive D3. This pattern is certainly not unique to our time series charts, in-fact it's pretty common to React and Redux applications. In this example, I will show you how to make the simplest area chart I could devise. #Coding a Chart, Automatically. Let us understand each of these in detail. i have created the grouped x axis in d3 v4 as below but the problem is 1. No d3 element in the line graph covers just that area — they also house axes labels, padding, etc. A data point in a conventional bar graph is represented by a bar that starts on the x-axis with full opacity, and ends at a height corresponding to the data value. js wiki to be too little explanation with too much going on. chartType (ChartType) - indicates the type of charts, it can be: line, bar, radar, pie, polarArea. Before we go into all of the D3. Create points on a D3 multiline graph. The profit graph below shows the same information as the break-even chart. Document's body starts at line 8 and as of now only includes two objects: a div element of class svg-container - that will hold our svg, and the svg appended to that div. In the code I have used the d3. Update 8 Jul 2017: I’ve created a GitHub repository, where you can check out the code example below. Marker graph is a very flexible chart type. Manipulating and presenting geographic data can be very. Data is the new medium of choice for telling a story or presenting compelling information on the Internet and d3. SVG Basic Shapes and D3. For example, let's talk about the Alampros Gantt Chart. We will continue to build on what we did previously. For example, you can use D3 to generate an HTML table from an array of numbers. The end This sums up my tutorial on creating a basic D3 line graph that displays Bitcoin prices from JSON data from an API call. *FREE* shipping on qualifying offers. Line Type Orientation. Updated October 12, 2017. Simple scatterplot with d3. This is how we. No d3 element in the line graph covers just that area — they also house axes labels, padding, etc. This post discusses things like how to easily create create Angular directives for each graph/chart and creating ng3-charts inside Angular directives. For those who have not heard about D3. You can’t place a binary value in a line chart along a numerical value like the sensor readings. Leave room for 1 pixel of padding between data points. However, this post is concerned with the demonstration of fundamental concepts in D3 as opposed to the promotion of one type of visualization. layerX is the offset I found by experimenting. Using pure d3. To learn more, attend John Niedzwiecki's talk, "D3 + Angular = Visual Awesomesauce," at Connect. Although it "looks" like it ends 1 day early, it actually does show all the points. In this article we'll make a Line chart usnig d3. Easy annotation coloring, new badge options. Once this plugin was defined, it was only a couple extra lines of Python to make this happen! I think that this plugin framework is sufficiently flexible that, with a bit of knowledge of d3 and of the mpld3 javascript object structure, you could do almost anything with. line() to draw our line graph. Line Chart with D3js. For this, we need to create a line generator function which returns the x and y coordinates from our data to plot the line. This is not possible in Google Charts, where you can only create frequently used charts like bar, line, column, etc. Line Graphs are used to display quantitative values over a continuous interval or time period. The important point is that only one component renders when the event or action occurs. x is not a d3 selection, it is a dimple. js Directives for d3. Basically, the important parts are that I’m using a factory to create “LineGraph()”. , the data). If you count the data points on the chart, the number should match. I'll be posting updates on Twitter, feel free to follow me if you want to be notified of updates. Line generator. It is similar to a scatter plot except that the measurement points are ordered (typically by their x-axis value) and joined with straight line segments. And since it was designed to work with modern web dev […]. Tooltip which shows all visible series data. js), which is heavily used in visualization. SAPUI5 VIZ Charts are great but in some scenarios you may need functionality not yet supported: For example: D3 Path Transitions. Does anyone know how to create line charts on D3? I have a scatter plot visualization on D3 which honestly a line graph would be cleaner given the way the plots are arranged. Draw a Point 03. Now, whenever the mouse cursor is over the area of the graphs, we can associate the current cursor position to the nearest data point on the chart and make a line active (increasing the thickness). D3 based reusable chart library. Adapted from Gord Lea's Block. These two graphs use the same json object for data and share an input range and the radio button. D3 selections allow DOM elements to be selected in order to do something with them, be it changing style, modifying their attributes, performing data-joins or inserting/removing elements. Put data field that you want to show (here Sales) in the line chart in the Value; The line chart is basically done. In this lesson you will learn how to create a simple D3 line graph based on your own data. D3 provides a way to deal with fitting given data sets within a given range and takes care of all of the complex mathematical calculations for you. The "Challenge 2: Line Graph & Solution" Lesson is part of the full, Introduction to Data Visualization with d3. js it's very important to have some basic knowledge of SVG, so if you are not aware of the SVG elements then please spend some time to read my previous blog post. js, Drawing an SVG Ellipse using D3. The final line grabs the data from our d3. This pattern is certainly not unique to our time series charts, in-fact it's pretty common to React and Redux applications. If you there are any features you would like clarification on, or you're not sure how to do something, please either post a code snippet in the Gitter Channel or contact us through our Github Issues Page. Hello, First, thanks for D3! I'm trying to figure out how to append svg:circles at each point on a line chart. It adds a level of complexity that you don't encounter in making a simple single bar or line chart. Generally, it's good idea to fetch data via AJAX request rather than embedding it in the web page. Diagrams and flowcharts. Let us understand each of these in detail. This post has five examples. Line Chart with D3js. This is a example for basic line chart using D3. For example, let's talk about the Alampros Gantt Chart. js is a data visualization library by Mike Bostock, who is also the primary creator of Protovis, which D3 is designed to replace. Then, you'll learn about how D3 binds data to graphical elements and how this helps you to build out any imaginable graphical representation of your data. Or, use the same data to create an interactive SVG bar chart with smooth transitions and interaction. js, you're going to create a simple line chart by using the Chart. Does anyone know how to create line charts on D3? I have a scatter plot visualization on D3 which honestly a line graph would be cleaner given the way the plots are arranged. To remedy, we overlaid a transparent SVG to the graph's exact dimensions. js and how to it in realtime with Pusher Channels. SVG Basic Shapes and D3. In the code I have used the d3. js, we can create various kinds of charts and graphs from our data. js , it is a powerful JavaScript library that can be used for creating beautiful, scalable, static or interactive drawings, figures, plots, graphs, diagrams etc. Document's body starts at line 8 and as of now only includes two objects: a div element of class svg-container - that will hold our svg, and the svg appended to that div. Buy a License. domain([0,max]) However, if you just keep the settings like this, the points will be based on the top horizontal edge instead of the bottom horizontal line as what we expected. The next thing we want to do is to create a line between all the data points to indicate a trend for example. With the open source D3 JavaScript data visualization library, we can go far beyond basic bar, line, and pie charts. Next Steps. To calculate slope if we are not given the graph, but instead just have two points that are on the line, we can use the formula: Step 1 : Label the coordinates of the two points on every line. At this point, you should have a bar graph that updates in realtime. …We can arrange our get data on multiple lines here,…as long as it's within. Besides handling multiple lines, we will work with time and linear scales, axes, and labels – or rather, have them work fo. In an Excel line chart, points are usually connected by straight lines (and I can tell you why you shouldn’t use smoothed lines). js is extremely powerful when it comes to handling geographical information. Creating a chart with D3 and TypeScript - part 2 In the previous article , we ended up with a nice axis drawn using d3, as a starting point to a fully working chart.   Along with requiring some knowledge of D3's many layout tools, it requires doi. line // assign the X function to plot our line as we wish. Then I set data points and tool tips for it. We have noticed some browser issues on rendering D3 charts correctly. Nov 4, 2012 • Aishwarya Singhal. This is the world's favourite way of animating a line chart, particularly as it makes a ton of sense when graphing a time series. line(): var lineGenerator = d3. js Examples and Demos. Set regions for each data with style. I'm struggling with plotting a single line in Power BI custom visual. js Projects She starts with a "scrollytelling" line chart and moves into bar charts and small multiple bar charts with linked mouseovers and. We could make our graph wider and D3 would automatically increase the spacing of our data points, but instead let’s selectively render the labels for the data points and change the formatting of the date. D3 Line chart with points, zoom and download. This tutorial will guide you through creating a bar chart using the JavaScript D3 library. Here’s a pretty graph to go with it. js Examples and Demos. Thus, a D3 line function is often used to generate the data needed for an SVG path, not a line element. js, Drawing an SVG Rectangle using D3. into x and y points var line = d3. cell d32 should actually be dated, if dates are used, 7/30. D3 for Web Maps and Geographic Data Visualization. js is used to create a static SVG chart. Simple line graph. js and nvd3. The library currently supports interactive line charts and scatterplots, whenever the graph scale is modified the function is evaluated again with the new bounds. I'm able to plot chart with axes, but the line doesn't appear. js pie/donut chart corkscrew entry animation by Jonathan George (@jongeorge1) on CodePen. The only difference from the above is that we passed d3. A line chart or line graph is essentially a connection between various data points "markers" by line segments. Label is either a single string, or it may be a string[] representing a multi-line label where each array element is on a new line. Over 1000 D3. Graph data visualization with vis. Tech, September 21-22, 2017, in Atlanta. Find out how to achieve this effect using JavaScript and D3. Scalable Vector Graphics; points - space-separated list of points representing vertices Draws a line from the cursor's. js to draw beautiful representations of your data. js v3 and pseudo-data (interactive tutorial and example) NOTE: Looking for the newest version of this tutorial using the latest version of D3. D3 was created by Mike Bostock using his giant brain. What can I do with it? Bar charts, line graphs, scatterplots and more. Did anyone try to do this? Well in version 5. 3D scatterplots and globes. One of the most common charts created with D3 is a line chart, often consisting of a series of SVG elements to visualize the data. js is an extraordinary framework for presentation of data on a web page. The RGraph library provides SVG and canvas support and it's a Free and Open Source library (MIT). As I began using D3. pie() function takes in a dataset and creates handy data for us to generate a pie chart in the SVG. Line Charts Example. Conclusion. Here we need to be even more careful than for points, since it matters whether or not the line crosses the antimeridian. DiagrammeR. Here's what you'd learn in this lesson: Shirley walks through the solution to Challenge 2 of creating a line graph and answers questions from students. Among many tasks, I developed few charts that help to process the result of ML models like Naive Bayes in form of a line chart or grouped bar chart. The remaining ones are row charts that will show the data broken down by gender, age segments, phone brands and Chinese provinces. How to create adaptive pie donut charts with transitions in D3. 3D force-directed graph component using ThreeJS/WebGL. This is how we. js Use the power of D3. Create animated & interactive charts with hundreds of thousands of data records using the ZingChart JavaScript charting library. Besides handling multiple lines, we will work with time and linear scales, axes, and labels – or rather, have them work fo. compose adds advanced chart layout and composition to d3 and d3. Let’s say that we want our needle to 60px tall and 20px wide at the base. Here we are making Muli Line chart with points, zoom and download. pie() The d3. Put data field that you want to show (here Sales) in the line chart in the Value; The line chart is basically done. In the chart above, I have a top and bottom axis, labels, bars representing data (with another set as background) and ticks representing the median data point. js chart wrapped in a React component Adding pagination and statistics widgets. js, Drawing an SVG Rectangle using D3. Accordingly, accountants have developed the Profit Graph to show the same information but with fewer lines. Building graph visualizations is always fun, regardless of the tool you choose and whatever data you’re looking at. Let’s say that we want our needle to 60px tall and 20px wide at the base. In this How to integrate React and D3 – The right way tutorial we will take a look at integrating React with another very popular javascript component (d3. And, if you've made a control chart by hand or sat in a class, you'll likely have memories of bizarre constants like d2, A2, etc. So let’s go ahead and define an array of co-ordinates:. Line 14 - 15 extracts the currently selected data by the clicked button; line 16 sets data_extent. Now, whenever the mouse cursor is over the area of the graphs, we can associate the current cursor position to the nearest data point on the chart and make a line active (increasing the thickness). Basic line Ajax loaded data, clickable points With data labels With annotations Time series, zoomable Spline with inverted axes Spline with symbols Spline with plot bands Time data with irregular intervals Logarithmic axis Line chart with 500k points. Therefore, I created. Interpolates d attribute smoothly when A and B have different number of points. In the next part of this series, we'll take this tutorial to the next level by making the multi-line chart dynamic, and we'll also add some features to make the graph more interactive. One of the things I appreciate most about D3 components is that, regardless of the complexity of the component itself, adding one to a chart is typically a really simple process, and these components will illustrate that elegance. Simple line graph. But changing #scatter to #line obviously isn't enough and I'm not too experienced in D3 outside of manipulating templates. Updated October 12, 2017. In order to make our learning close to real life problem we will use the data provided by Nasa and use that to create our Interactive Charts. Line Graph 1. As well, we'll be using both linear scaling and string interpolation. Here’s a pretty graph to go with it. js; Multi-series Line Chart with Long Format. 1 we will use JET Charts anyway but at the moment that is still not available. js is used to create a static SVG chart. Their behaviour is limited but it's a start. If our "data point" is a probability density function, then for our uncertain bar graph we should plot a bar whose opacity goes to zero as we pass through the "data point". d3_line_chart" expecially regarding chart management. C3 makes it easy to generate D3-based charts by wrapping the code required to construct the entire chart. Although it "looks" like it ends 1 day early, it actually does show all the points. Basic line Line chart with 500k points Area charts. Starting from the initial equilibrium point (#1), what point on the graph is most likely to result from the introduction of technological improvements in bicycle assembly, and publicity campaigns by the government on the virtues of bicycling to work? (P). My code uses an Observable collection to collect the data points. Create rich, data-bound charts by composing charts (like Line and Bars) and components (like Axis, Title, and Legend). Solution 1: Use d3. HTML5 & JS Line Charts A line chart is a type of chart which displays information as a series of dataPoints connected by straight line segments. When building D3 visualizations with Angular directives, it often happens that the D3 directive gets 1000 lines of code or even more. #Coding a Chart, Automatically. In this case we need to improvise. js Graph; New Version of D3 Tips and Tricks PDF Added; Getting the Data; Setting up the margins and the graph area. We will need some test data that we want to show in our visualization. D3 based reusable chart library. 3D scatterplots and globes. The combo chart exhibits both behaviors, and this option has no. line path generator. D3 does NOT follow the template model some other visualization toolkits use. I hadn't worked with SVG elements before, but each element must be individually drawn and located within the canvas. Above is an animated gif of a HANA XS Html, that calls a HANA XSJS every second and appends latest results to the FAR RIGHT, shifting the results to the LEFT. Android and iOS multiline/line/scatterPoint chart based on React Native and d3. Advantages of D3. defined() You may not know this, but d3. Building the Chart. interpolators - register a custom interpolator. For example, you can use D3 to generate an HTML table from an array of numbers. View details ». Bar Chart. json request and plots the line using the line variable we created earlier. Draw a Point 03. This library allows you to add such elements like milestones and datelines that provide the user with the possibility draw a line in the Gantt chart to point a relevant day. Building graph visualizations is always fun, regardless of the tool you choose and whatever data you’re looking at. Working with graphing libraries can be tedious. We must take the X data and set it on the axis so that the maximum X value (i. #Coding a Chart, Automatically. Both brushes and tooltips can be an important part of creating dynamic D3 visualizations. It doesn't need any styling since we'll do that with d3 directly, but splashing some CSS on stuff in the graph is going to make things look much better. js and how to it in realtime with Pusher Channels. Fantastic D3 Cheat Sheet Posted by Jerome Cukier; D3 JavaScript Simple Graph; The CSS Portion of a D3 Graph; The HTML Portion of a D3 Graph; Starting with a basic D3 line graph; D3 Hello World. Basically, the important parts are that I’m using a factory to create “LineGraph()”. It helps to draw the following charts − Bar Chart; Circle Chart; Pie Chart; Donut Chart; Line Chart; Bubble Chart, etc. jqPlot produces beautiful line, bar and pie charts with many features: Numerous chart style options. line() to draw our line graph. js has become the holy grail of interactive data visualization. Lines 27 - 38 contains the magic which sets up our chart by making the margins, the buttons, the title, and the axes. Manipulating and presenting geographic data can be very. For example, you can use D3 to generate an HTML table from an array of numbers. js Directives for d3. The library currently supports interactive line charts and scatterplots, whenever the graph scale is modified the function is evaluated again with the new bounds. A data point represents two values, one plotted along the horizontal axis and another along the vertical axis. A data point in a conventional bar graph is represented by a bar that starts on the x-axis with full opacity, and ends at a height corresponding to the data value. If you want to jump straight to "the answer," see the complete JavaScript. Use D3 to build an SVG bar chart. Comfortable. 3) matches the pixel width of the chart area. It provides a simple way to produce common types of graphics in a principled, consistent and responsive way. So I made up my mind to study D3. js version 5. Use d3 to create a new path/line; Use d3 to create new points; I think the d3 new path/line method is more interesting, so I'll choose that route. Drawing a straight line with D3. Then I set data points and tool tips for it. Line Charts (and Time) Line charts take a special form of data - objects with 2 data points, for the x & y coordinates, as an array. At the top, we have our main React component whose state is the "One Source Of Truth" (guideline #1). With focus on small screens, these examples might help you to improve the readability and usability of your charts. One of the major points in favor of D3. Why React + D3. Does anyone have a simple line chart zoom example I can look at? Thanks -- You received this message because you are subscribed to the Google Groups "d3-js" group. js and finally I made it!!! I will show how to make it through 7 steps. js that sets a sparkline aside from a regular line graph -- it is a small visual representation of data. Drawing a straight line with D3. js can be used for much more than just DOM manipulation, or to draw charts.   Along with requiring some knowledge of D3's many layout tools, it requires doi. D3 graph plugin; D3 graphics in a Pergola SVG UI; D3 heatmap using Backbone. The line graphs are displayed correctly on the redirected page from major browsers like Firefox, Chrome, Safari, and Opera (with recently updated versions). js visual control. Correct, i want to add a link to the D3 Chart series (so you can click data Points and branch to another page). In this case our array of date values. Basically, the important parts are that I’m using a factory to create “LineGraph()”. js is that you can make your visualizations the way you want. js and webgl and supports over 20 types of interactive charts. You should be able to see the multi-line chart as shown: Conclusion. In order to make our learning close to real life problem we will use the data provided by Nasa and use that to create our Interactive Charts. Finally, we looked at a comparable D3 line chart to compare the routines needed to produce the same effect. I found some nice examples of pie/donut chart entry animations, where segments animate in one by one, but none of them were quite what I was looking for. js is used to create a static SVG chart. On the other hand, a D3 line function can describe a line through many different points, and can thus be anything but straight. See what ZingChart's 35+ built-in chart types & modules can do for your data visualization projects. In this post I have collected some techniques that I used recently when creating D3 Charts. These two graphs use the same json object for data and share an input range and the radio button. With D3 you need to append a new text element to links, but you can't just append a g element to group line and text, the way we did with nodes. js, just for fun, to show the D3 capabilities. (As a mapper, you will especially be awed by Jason Davies and his contributions. Note: As with my previous D3 posts, my starting point for this work was the chart Tom developed in his article on OHLC and candlestick components - you'll see that I'm using his candlestick chart here. js's SVG capabilities by producing a stunning bar chart with a relatively small amount of code. So I made up my mind to study D3. Updated April 20, 2017. js is not a chart library. Line 12 Create a random data array with values in the domain [0, 1]. I have 5 points to be measured, but my chart displays 10 points, the first 5 with the correct deviation, and the last 5 points are suited at zero. Everything looks good, except there’s a break in the line chart. js is an open source JavaScript library used to create beautiful data representations which we can view in any modern browser. See what ZingChart's 35+ built-in chart types & modules can do for your data visualization projects. The next section actually appends the line charts into the SVG element. So far, we have: Part 1: Getting started with SPFx and D3 Part 2: SPFx and D3 Trees Part 3: Making D3 Trees…. js and finally I made it!!! I will show how to make it through 7 steps. We can easily fill this in by giving our forecast array another data point that matches the last history data point exactly. js Path Data Generator Line Example. Put simply, it’s easier to build a terrible graph visualization in D3, and easy to build something powerful and beautiful with Keylines. To draw a line chart in Power BI, follow the following steps, Single Line Chart. Simple line graph. But D3 charting can automatically pan and zoom ( both by rect zoom by pressing control and left dragging the mouse on the chart, or by the wheel ) and in this case we loose the axis synchronization. All you need is to get the property name for each line and loop. It is useful to note the method for orphaning the legend before updating the chart. Basic line Ajax loaded data, clickable points With data labels With annotations Line chart with 500k points Area charts. Constructing scales. defined() You may not know this, but d3. Of course hard-coding is impractical for most datasets, and the point of this tutorial is to teach you how to create charts from data automatically. Streaming the Axis 04. Besides handling multiple lines, we will work with time and linear scales, axes, and labels – or rather, have them work fo. It is similar to a scatter plot except that the measurement points are ordered (typically by their x-axis value) and joined with straight line segments. Basically, the important parts are that I’m using a factory to create “LineGraph()”. I attempted to reproduce your issue, and I am unable to do so. They can surely work together, and we are empowered to choose where to draw the line between them. This was written using d3. This post is going to give an example of how to use both cooperatively, with a solution inspired by Mike Bostock's remarks here. js line chart with multiple lines and points. line (); lineGenerator is just a function that accepts an array of co-ordinates and outputs a path data string. I cannot get the graph to display until all of the data has been processed. Above is an animated gif of a HANA XS Html, that calls a HANA XSJS every second and appends latest results to the FAR RIGHT, shifting the results to the LEFT. js v4 course featured in this preview video. To start coding line chart visualizations in D3. Given example shows simple Line Chart along with HTML. js version 5. js | 225 that, we won’t draw each value as a point. MPM IDI- - D3 - Slope Example 2. Over 2000 D3. To learn more, attend John Niedzwiecki's talk, "D3 + Angular = Visual Awesomesauce," at Connect. I used d3 to read the data associated with the chart, from a csv file. 1 Line Chart. I have 5 points to be measured, but my chart displays 10 points, the first 5 with the correct deviation, and the last 5 points are suited at zero. …So, we've got stroke of green…and we'll give it a stroke-width there of two. D3 based reusable chart library. The profit graph below shows the same information as the break-even chart. A Bar Chart. interpolators - register a custom interpolator. compose adds advanced chart layout and composition to d3 and d3. Building graph visualizations is always fun, regardless of the tool you choose and whatever data you’re looking at. For example, you can use D3 to generate an HTML table from an array of numbers. line // assign the X function to plot our line as we wish. The y axis looks okay, but the x axis is too packed with points of data. D3 chart for common temperature/rh time-series data. - [Instructor] Now, that our data are shipshape,…let's set about using them to draw a line chart. Note that it is basically a line chart with data points represented as well. Label is either a single string, or it may be a string[] representing a multi-line label where each array element is on a new line. The fact-checkers, whose work is more and more important for those who prefer facts over lies, police the line between fact and falsehood on a day-to-day basis, and do a great job. Today, my small contribution is to pass along a very good overview that reflects on one of Trump’s favorite overarching falsehoods. Namely: Trump describes an America in which everything was going down the tubes under  Obama, which is why we needed Trump to make America great again. And he claims that this project has come to fruition, with America setting records for prosperity under his leadership and guidance. “Obama bad; Trump good” is pretty much his analysis in all areas and measurement of U.S. activity, especially economically. Even if this were true, it would reflect poorly on Trump’s character, but it has the added problem of being false, a big lie made up of many small ones. Personally, I don’t assume that all economic measurements directly reflect the leadership of whoever occupies the Oval Office, nor am I smart enough to figure out what causes what in the economy. But the idea that presidents get the credit or the blame for the economy during their tenure is a political fact of life. Trump, in his adorable, immodest mendacity, not only claims credit for everything good that happens in the economy, but tells people, literally and specifically, that they have to vote for him even if they hate him, because without his guidance, their 401(k) accounts “will go down the tubes.” That would be offensive even if it were true, but it is utterly false. The stock market has been on a 10-year run of steady gains that began in 2009, the year Barack Obama was inaugurated. But why would anyone care about that? It’s only an unarguable, stubborn fact. Still, speaking of facts, there are so many measurements and indicators of how the economy is doing, that those not committed to an honest investigation can find evidence for whatever they want to believe. Trump and his most committed followers want to believe that everything was terrible under Barack Obama and great under Trump. That’s baloney. Anyone who believes that believes something false. And a series of charts and graphs published Monday in the Washington Post and explained by Economics Correspondent Heather Long provides the data that tells the tale. The details are complicated. Click through to the link above and you’ll learn much. But the overview is pretty simply this: The U.S. economy had a major meltdown in the last year of the George W. Bush presidency. Again, I’m not smart enough to know how much of this was Bush’s “fault.” But he had been in office for six years when the trouble started. So, if it’s ever reasonable to hold a president accountable for the performance of the economy, the timeline is bad for Bush. GDP growth went negative. Job growth fell sharply and then went negative. Median household income shrank. The Dow Jones Industrial Average dropped by more than 5,000 points! U.S. manufacturing output plunged, as did average home values, as did average hourly wages, as did measures of consumer confidence and most other indicators of economic health. (Backup for that is contained in the Post piece I linked to above.) Barack Obama inherited that mess of falling numbers, which continued during his first year in office, 2009, as he put in place policies designed to turn it around. By 2010, Obama’s second year, pretty much all of the negative numbers had turned positive. By the time Obama was up for reelection in 2012, all of them were headed in the right direction, which is certainly among the reasons voters gave him a second term by a solid (not landslide) margin. Basically, all of those good numbers continued throughout the second Obama term. The U.S. GDP, probably the single best measure of how the economy is doing, grew by 2.9 percent in 2015, which was Obama’s seventh year in office and was the best GDP growth number since before the crash of the late Bush years. GDP growth slowed to 1.6 percent in 2016, which may have been among the indicators that supported Trump’s campaign-year argument that everything was going to hell and only he could fix it. During the first year of Trump, GDP growth grew to 2.4 percent, which is decent but not great and anyway, a reasonable person would acknowledge that — to the degree that economic performance is to the credit or blame of the president — the performance in the first year of a new president is a mixture of the old and new policies. In Trump’s second year, 2018, the GDP grew 2.9 percent, equaling Obama’s best year, and so far in 2019, the growth rate has fallen to 2.1 percent, a mediocre number and a decline for which Trump presumably accepts no responsibility and blames either Nancy Pelosi, Ilhan Omar or, if he can swing it, Barack Obama. I suppose it’s natural for a president to want to take credit for everything good that happens on his (or someday her) watch, but not the blame for anything bad. Trump is more blatant about this than most. If we judge by his bad but remarkably steady approval ratings (today, according to the average maintained by 538.com, it’s 41.9 approval/ 53.7 disapproval) the pretty-good economy is not winning him new supporters, nor is his constant exaggeration of his accomplishments costing him many old ones). I already offered it above, but the full Washington Post workup of these numbers, and commentary/explanation by economics correspondent Heather Long, are here. On a related matter, if you care about what used to be called fiscal conservatism, which is the belief that federal debt and deficit matter, here’s a New York Times analysis, based on Congressional Budget Office data, suggesting that the annual budget deficit (that’s the amount the government borrows every year reflecting that amount by which federal spending exceeds revenues) which fell steadily during the Obama years, from a peak of $1.4 trillion at the beginning of the Obama administration, to $585 billion in 2016 (Obama’s last year in office), will be back up to $960 billion this fiscal year, and back over $1 trillion in 2020. (Here’s the New York Times piece detailing those numbers.) Trump is currently floating various tax cuts for the rich and the poor that will presumably worsen those projections, if passed. As the Times piece reported: