Published
Edited
Jun 23, 2020
25 Apr 2020: First Bar Chart26 Apr 2020: Bar Chart Revisited27 Apr 2020: Finalising the Bar Chart28 Apr 2020: What Else I Learned From That Bar Chart29 Apr 2020: Setting up Observable30 Apr 2020: What Else Can I Do With This Bar Chart?1 May 2020: Formatting Numbers and Sorting a Bar Chart2 May 2020: Exploring More of Observable and Vega-Lite3 May 2020: Exploring More Vega-Lite4 May 2020: Vega-Lite Scatterplot and Heat Map, and More Posts on Getting Started With Data Viz5 May 2020: Vega-Lite Scatterplot continued6 May 2020: D3 Scatterplot7 May 2020: D3 Scatterplot with Legends8 May 2020: D3 Scatterplot with Tooltips9 May 2020: D3 Scatterplot with Voronoi Tooltips10 May 2020: Line charts11 May 2020: Vega-Lite Line Charts12 May 2020: D3 Line Chart13 May 2020: D3 Multi-Line Chart14 May 2020: D3 Multi-Line Chart with Annotations15 May 2020: D3 Multi-Line Chart with Shading16 May 2020: Donut Charts and Pie Charts17 May 2020: Pie Charts in Vega-Lite18 May 2020: Donut Chart in Vega-Lite19 May 2020: Donut Chart in D320 May 2020: Donut Chart in D3 with Footnotes21 May 2020: Donut Chart in D3 with Tooltips22 May 2020: Area Charts, Stacked Area Charts, Stream graphs and Ridgelines23 May 2020: Area Charts in Vega-Lite and CSV Parsing24 May 2020: Area Charts in D3 with Tooltips25 May 2020: Cumulative Area Chart in D3 with Tooltips26 May 2020: Histograms and Density Plots27 May 2020: Exploratory Histogram28 May 2020: D3 Histogram29 May 2020: D3 Histogram Styling30 May 2020: Data Tables31 May 2020: Wikipedia Data Tables1 June 2020: Wrangling Wikipedia List Data and Summary Statistics2 June 2020: Treemaps, Dendrograms, Sunbursts, Circle Packing, and Tree Diagrams3 June 2020: D3 Tree Diagram and D3 Hierarchy4 June 2020: D3 Clustered Dendrogram5 June 2020: D3 Radial Tidy Tree and Radial Dendrogram6 June 2020: D3 Collapsible Tidy Tree7 June 2020: D3 Collapsible Tidy Tree (Improved)8 June 2020: Designing for Touch Devices: Drag, Click, Hover, Focus, Scroll, Zoom, Delaunay, Voronoi9 June 2020: Designing for Small Screens: Responsive Data Viz, Resizing, and Aspect Ratios10 June 2020: Typography for Data Viz11 June 2020: Color in Data Viz12 June 2020: Styled Bar Chart13 June 2020: Accessible Bar Chart and Accessible Data Table14 June 2020: Line Chart with Points and Bar Chart15 June 2020: Network Diagrams16 June 2020: D3 Disjoint Force-Directed Graph17 June 2020: D3 Bar Chart with Textured Line18 June 2020: D3 Bar Chart Transitions19 June 2020: D3 Bar Chart Transitions (Improved)20 June 2020: Sketchy D3 Bar Chart Style21 June 2020: Brushing to Filter and Zoom Using D3 Brush22 June 2020: D3 Bar Chart Brush (Work In Progress)24 June 2020: Hatched Pattern Effect Bar Chart25 June 2020: Checkerboard Fill Effect Bar Chart26 June 2020: D3 Bar Chart Brush27 June 2020: Using Textures28 June 2020: Charting Typing Speed: Data and Exploration29 June 2020: Charting Typing Speed: Data and Exploration with Vega-Lite30 June 2020: Charting Typing Speed: Data and Exploration with Vega-Lite and Datawrapper1 July 2020: Charting Typing Speed: Data and Exploration with Vega-Lite Bubble Chart2 July 2020: Charting Typing Scores: Data and Exploration with Vega-Lite3 July 2020: Journal Updates and User Testing4 July 2020: About Heatmaps5 July 2020: Data Wrangling for a Heatmap6 July 2020: D3 Heatmap Without Sorting7 July 2020: D3 Heatmap With Sorting8 July 2020: D3 Heatmap with Legend9 July 2020: D3 Heatmap Styled10 July 2020: About Bubble Charts11 July 2020: D3 Bubble Chart12 July 2020: D3 Bubble Chart with Labels on Hover13 July 2020: D3 Bubble Chart with Voronoi Labels on Hover14 July 2020: D3 Bubble Chart with Voronoi Tooltips15 July 2020: About Population Pyramids16 July 2020: Data Wrangling for Population Pyramids17 July 2020: D3 Population Pyramid18 July 2020: About Sankey, Alluvial, Parallel Sets, and Parallel Coordinates19 July 2020: Data Wrangling for a Sankey Diagram20 July 2020: D3 Sankey Diagram21 July 2020: D3 Sankey Diagram with Hovers and Percentages22 July 2020: D3 Parallel Coordinates23 July 2020: D3 Parallel Coordinates (Updates)24 July 2020: About Slope Charts25 July 2020: Data Wrangling for a Slope Chart26 July 2020: D3 Slope Chart27 July 2020: D3 Slope Chart with Color28 July 2020: D3 Slope Chart with Highlight Color and Gray Context Lines29 July 2020: D3 Slope Chart Small Multiples (Work in Progress)30 July 2020: D3 Slope Chart Small Multiples31 July 2020: About Dumbbell or Connected Dot Plots1 August 2020: D3 Dumbbell Plot2 August 2020: 100 Days of Data VizAbout TimelinesBuilding TimelinesAbout SparklinesAbout Circle PackingD3 Circle PackingD3 Circle Packing with Data Wrangling and Interactive GroupingSort by arbitrary arrayAbout Choropleth MapsAbout Map Data: GeoJSON and TopoJSON with D3
23 June 2020: Linear Regression
ss = require("simple-statistics@7")
linearRegression = ss.linearRegression(data.map(d => ([+d.x, d.y]))); // coerce d.x date to a number
linearRegressionLine = ss.linearRegressionLine(linearRegression);
regressionEndpoints = [
{ x: data[0].x, y: linearRegressionLine(+data[0].x) },
{ x: data[data.length - 1].x, y: linearRegressionLine(+data[data.length - 1].x) }
]
chart = {
const svg = d3.create("svg")
.attr("title", data.barChartSVGTitle)
.attr("class", "chart")
.attr("viewBox", [0, 0, width, height]);
const defs = svg
.append("defs");
const pencil = DOM.uid("pencil");
defs.append("filter").attr("id", pencil.id)
.html(`<feTurbulence baseFrequency="0.01" numOctaves="6" type="fractalNoise" />
<feDisplacementMap scale="4" in="SourceGraphic" xChannelSelector="R" yChannelSelector="G" />
<feGaussianBlur stdDeviation="0.5" />`)
svg.append("g")
.attr("class", "chart-title")
.call(chartTitle);
svg.append("g")
.attr("class", "bars")
.selectAll("rect")
.data(data)
.join("rect")
.attr("role", "presentation")
.attr("class", "bar")
.attr("x", d => x(d.x))
.attr("y", d => y(d.y))
.attr("width", x.bandwidth())
.attr("height", d => y(0) - y(d.y))
.style("fill", barColor);
svg.append("path")
.attr("id", "linear-regression-fitted-line")
.datum(regressionEndpoints)
.attr("fill", "none")
.attr("filter", pencil) // optional pencil filter styling
.attr("stroke", "#534e7a")
.attr("stroke-width", 3)
.attr("stroke-linejoin", "round")
.attr("stroke-linecap", "round")
.attr("d", d3.line()
.x(d => x(d.x))
.y(d => y(d.y)));
svg.append("g")
.attr("class", "chart-by")
.call(chartBy)
return svg.node();
}
x = d3.scaleBand()
.domain(data.map(d => d.x))
.range([margin.left, width - margin.right])
.padding(0.1);
y = d3.scaleLinear()
.domain([0, d3.max(data, d => d.y)]).nice()
.range([height - margin.bottom, margin.top]);
chartTitle = g => g
.append("text")
.attr("id", "chart-title")
.attr("x", 0)
.attr("y", 0)
.attr("dy", "1em")
.style("font-weight", "800")
.style("font-size", "clamp(.7rem, 2.5vw, 1.2rem)") // minimum, preferred, maximum
.text(data.barChartTitle);
chartBy = g => g
.attr("transform", `translate(${width}, ${height})`)
.append("text")
.attr("id", "source")
.attr("x", 0)
.attr("y", 0)
.attr("dy", "-0.5em")
.attr("text-anchor", "end")
.text('@DiDoesDigital');
margin = ({top: 24, right: 0, bottom: 48, left: 0})
barColor = "#766FAE"
inactiveColor = "#E6E5F0"
activeColor = "#534e7a"
accessibleDataTable = render_data_table(data, {caption: data.tableCaption, columns: data.slice[0], focusable: false})
data[0]
d3 = require("d3@5", "d3-array@2.4")
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