See also this histogram of an Irwin–Hall distribution.
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Irregular Histogram
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license: gpl-3.0 |
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Income | People | |
---|---|---|
0 | 245981 | |
8.8 | 150444 | |
30 | 126063 | |
49.9 | 123519 | |
70 | 115029 | |
90.7 | 277149 | |
109.1 | 355768 | |
130 | 324246 | |
150.3 | 353239 | |
170.2 | 396008 | |
190 | 396725 | |
210 | 398640 | |
230.1 | 401932 | |
250 | 416079 | |
270 | 412727 | |
289.8 | 385192 | |
309.7 | 343178 | |
329.7 | 293707 | |
349.6 | 239982 | |
369.7 | 201557 | |
389.3 | 165132 | |
442.3 | 442075 | |
543.4 | 196526 | |
679.9 | 146784 | |
883.9 | 48600 | |
1555 | 44644 |
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<!DOCTYPE html> | |
<meta charset="utf-8"> | |
<style> | |
svg { | |
font: 10px sans-serif; | |
} | |
rect { | |
fill: steelblue; | |
} | |
.axis path, .axis line { | |
fill: none; | |
stroke: #000; | |
shape-rendering: crispEdges; | |
} | |
</style> | |
<body> | |
<script src="//d3js.org/d3.v3.min.js"></script> | |
<script> | |
var margin = {top: 10, right: 20, bottom: 20, left: 60}, | |
width = 960 - margin.left - margin.right, | |
height = 500 - margin.top - margin.bottom; | |
var svg = d3.select("body").append("svg") | |
.attr("width", width + margin.left + margin.right) | |
.attr("height", height + margin.top + margin.bottom) | |
.append("g") | |
.attr("transform", "translate(" + margin.left + "," + margin.top + ")"); | |
var x = d3.scale.linear() | |
.range([0, width]); | |
var y = d3.scale.linear() | |
.range([height, 0]); | |
d3.csv("income.csv", function(error, bins) { | |
if (error) throw error; | |
// Coerce types. | |
bins.forEach(function(bin) { | |
bin.Income = +bin.Income; | |
bin.People = +bin.People; | |
}); | |
// Normalize each bin to so that height = quantity/width; | |
// see http://en.wikipedia.org/wiki/Histogram#Examples | |
for (var i = 1, n = bins.length, bin; i < n; i++) { | |
bin = bins[i]; | |
bin.offset = bins[i - 1].Income; | |
bin.width = bin.Income - bin.offset; | |
bin.height = bin.People / bin.width; | |
} | |
// Drop the first bin, since it's incorporated into the next. | |
bins.shift(); | |
// Set the scale domain. | |
x.domain([0, d3.max(bins.map(function(d) { return d.offset + d.width; }))]); | |
y.domain([0, d3.max(bins.map(function(d) { return d.height; }))]); | |
// Add the bins. | |
svg.selectAll(".bin") | |
.data(bins) | |
.enter().append("rect") | |
.attr("class", "bin") | |
.attr("x", function(d) { return x(d.offset); }) | |
.attr("width", function(d) { return x(d.width) - 1; }) | |
.attr("y", function(d) { return y(d.height); }) | |
.attr("height", function(d) { return height - y(d.height); }); | |
svg.append("g") | |
.attr("class", "x axis") | |
.attr("transform", "translate(0," + height + ")") | |
.call(d3.svg.axis() | |
.scale(x) | |
.orient("bottom")); | |
svg.append("g") | |
.attr("class", "y axis") | |
.call(d3.svg.axis() | |
.scale(y) | |
.orient("left")); | |
}); | |
</script> |
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