Exponential Regression Line Using numbers.js & d3.js

<!doctype html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <title>Exponential Regression Line Using numbers.js & d3.js</title>
    <script src="https://d3js.org/d3.v3.min.js"></script>
    <script src="numbers.js"></script>
    <style>
      body {font: 10px sans-serif;}
      
      .axis path,
      .axis line {
        fill: none;
        stroke: #000;
        shape-rendering: crispEdges;
      }
            
      .line {
        fill: none;
        stroke: steelblue;
        stroke-width: 1.5px;
      }
      
      .line.regression {
        stroke: red;
      }
    </style>
  </head>
  <body>
    <script>
      function rnd(a,b){return Math.floor(Math.random() * b) + a;}
      
      var data = [], i;
      
      for(i = 0; i < 50; i++){data.push(rnd(1000,5000))}
      for(i = 0; i < 100; i++){data.push(rnd(50,1000));}
      for(i = 0; i < 200; i++){data.push(rnd(50,200));}
      data.sort(function(a,b){return b-a;});
      
      var regression = numbers.statistic.exponentialRegression(data);
      
      var margin = {top: 20, right: 20, bottom: 30, left: 50},
          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]).domain([0,data.length]);
      var y = d3.scale.linear().range([height,0]).domain(d3.extent(data));
      
      var xAxis = d3.svg.axis().scale(x).orient('bottom');
      var yAxis = d3.svg.axis().scale(y).orient('left');
      
      var line = d3.svg.line().x(function(d,i){return x(i)}).y(function(d,i){return y(d)});
      var reg_line = d3.svg.line().x(function(d,i){return x(i)}).y(function(d,i){return y(regression(i))});
      
      svg.append('g')
        .attr('class','x axis')
        .attr('transform','translate(0,'+height+')')
        .call(xAxis);
      
      svg.append('g')
        .attr('class','y axis')
        .call(yAxis);
      
      svg.append('path')
        .datum(data)
        .attr('class','line')
        .attr('d',line);
      
      svg.append('path')
        .datum(data)
        .attr('class','regression line')
        .attr('d',reg_line);
    </script>
  </body>
</html>

Modified http://d3js.org/d3.v3.min.js to a secure url

https://d3js.org/d3.v3.min.js