--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/javascript/d3/examples/kde/kde.js	Thu Apr 10 14:20:23 2014 +0200
@@ -0,0 +1,40 @@
+// Based on http://bl.ocks.org/900762 by John Firebaugh
+d3.json("../data/faithful.json", function(faithful) {
+  data = faithful;
+  var w = 800,
+      h = 400,
+      x = d3.scale.linear().domain([30, 110]).range([0, w]);
+      bins = d3.layout.histogram().frequency(false).bins(x.ticks(60))(data),
+      max = d3.max(bins, function(d) { return d.y; }),
+      y = d3.scale.linear().domain([0, .1]).range([0, h]),
+      kde = science.stats.kde().sample(data);
+
+  var vis = d3.select("body")
+    .append("svg:svg")
+      .attr("width", w)
+      .attr("height", h);
+
+  var bars = vis.selectAll("g.bar")
+      .data(bins)
+    .enter().append("svg:g")
+      .attr("class", "bar")
+      .attr("transform", function(d, i) {
+        return "translate(" + x(d.x) + "," + (h - y(d.y)) + ")";
+      });
+
+  bars.append("svg:rect")
+      .attr("fill", "steelblue")
+      .attr("width", function(d) { return x(d.dx + 30) - 1; })
+      .attr("height", function(d) { return y(d.y); });
+
+  var line = d3.svg.line()
+      .x(function(d) { return x(d[0]); })
+      .y(function(d) { return h - y(d[1]); });
+
+  vis.selectAll("path")
+      .data(d3.values(science.stats.bandwidth))
+    .enter().append("svg:path")
+      .attr("d", function(h) {
+        return line(kde.bandwidth(h)(d3.range(30, 110, .1)));
+      });
+});