The line graph shows the Gini inequality index for a number of countries, and allows you to explore how they change over time.
The Gini Index is a measurement of income inequality ranging between 0 and 100. A rating of 0 represents perfect equality, and 100 represening perfect inequality.
I have highlighted a couple of countries: India, and the USA, but you can have a look at others by hovering your mouse pointer over the lines.
xxxxxxxxxx<html lang="en"> <head> <meta charset="utf-8"> <title>Income Inequality</title> <script type="text/javascript" src="https://d3js.org/d3.v3.js"></script> <style type="text/css"> body { background-color: white; font-family: "Trebuchet MS", Helvetica, sans-serif; } h1 { font-size: 24px; margin: 0; } p { font-size: 14px; margin: 10px 0 0 0; } svg { background-color: white; } path:hover { stroke: red; stroke-width: 2 } path { stroke: grey; stroke-width: 0.5; } g.highlight path { stroke: steelblue; stroke-width: 2; } .axis path, .axis line { fill: none; stroke: black; stroke-width: 1; shape-rendering: crispEdges; } .axis text { font-family: sans-serif; font-size: 11px; } </style> </head> <body> <h1>Income Inequality by Country</h1> <p>International income inequality, 1963-2008. Source: <a href="https://utip.gov.utexas.edu/data.html">University of Texas Inequality Project</a></p> <script type="text/javascript"> //Dimensions and padding var w = 700; var h = 600; var padding = [ 20, 10, 50, 30 ]; //Top, right, bottom, left //Set up date formatting and years var dateFormat = d3.time.format("%Y"); //Set up scales var xScale = d3.time.scale() .range([ padding[3], w - padding[1] - padding[3] ]); var yScale = d3.scale.linear() .range([ padding[0], h - padding[2] ]); //Configure axis generators var xAxis = d3.svg.axis() .scale(xScale) .orient("bottom") .ticks(15) .tickFormat(function(d) { return dateFormat(d); }); var yAxis = d3.svg.axis() .scale(yScale) .orient("left"); //Configure area generator var line = d3.svg.line() .x(function(d) { return xScale(dateFormat.parse(d.year)); }) .y(function(d) { return yScale(+d.amount); }); //Create the empty SVG image var svg = d3.select("body") .append("svg") .attr("width", w) .attr("height", h); //Load USA data d3.csv("incomeinequality.csv", function(data) { var years = ["1963", "1964", "1965", "1966", "1967", "1968", "1969", "1970", "1971", "1972", "1973", "1974", "1975", "1976", "1977", "1978", "1979", "1980", "1981", "1982", "1983", "1984", "1985", "1986", "1987", "1988", "1989", "1990", "1991", "1992", "1993", "1994", "1995", "1996", "1997", "1998", "1999", "2000", "2001", "2002", "2003", "2004", "2005", "2006", "2007", "2008"]; //Create a new, empty array to hold our restructured dataset var dataset = []; //Loop once for each row in data for (var i = 0; i < data.length; i++) { //Create new object with this country's name and empty array dataset[i] = { country: data[i].Country, gini: [] }; //Loop through all the years for (var j = 0; j < years.length; j++) { if (data[i][years[j]]) { dataset[i].gini.push({ year: years[j], amount: data[i][years[j]] }); } } } xScale.domain([ d3.min(years, function(d) { return dateFormat.parse(d); }), d3.max(years, function(d) { return dateFormat.parse(d); }) ]); yScale.domain([ d3.max(dataset, function(d) { return d3.max(d.gini, function(d) { return +d.amount; }); }), d3.min(dataset, function(d) { return d3.min(d.gini, function(d) { return +d.amount; }); }) ]); //Make a group for each country var groups = svg.selectAll("g") .data(dataset) .enter() .append("g") .classed("highlight", function(d) { if (d.country == "India" || d.country == "United States of America") { return true; } else { return false; } }); //Append a title with the country name (so we get easy tooltips) groups.append("title") .text(function(d) { return d.country; }); //Within each group, create a new line/path, //binding just the emissions data to each one groups.selectAll("path") .data(function(d) { return [ d.gini ]; }) .enter() .append("path") .attr("class", "line") .attr("d", line) .attr("fill", "none") .attr("stroke-width", 2); //Axes svg.append("g") .attr("class", "x axis") .attr("transform", "translate(0," + (h - padding[2]) + ")") .call(xAxis); svg.append("g") .attr("class", "y axis") .attr("transform", "translate(" + (padding[3]) + ",0)") .call(yAxis); }); </script> </body></html> Modified http://d3js.org/d3.v3.js to a secure url
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