SciFri Communication Modes Survey Results, Averages

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.axis path,
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    left: 0;
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<div id="myChart"></div>
<script src="https://d3js.org/d3.v3.min.js"></script>
<script>
/* can add a line of comments for viz code here */
var w = 850; //'100%';//850;
var h = 420;
var pad = 10;
var colors = ["#ccebc5","#a8ddb5","#7bccc4","#4eb3d3","#2b8cbe","#0868ac","#084081"];

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    // console.log(data);

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    width = chart_w - margin.left - margin.right,
    height = chart_h - margin.top - margin.bottom;

var x0 = d3.scale.ordinal()
        .rangeRoundBands([0, width], .1);

var x1 = d3.scale.ordinal();

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        .tickFormat(d3.format(".2s"));

var svg = d3.select(targSVG).append("svg")
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        .attr("height", height + margin.top + margin.bottom)
      .append("g")
        .attr("transform", "translate(" + margin.left + "," + margin.top + ")");

var ageNames = d3.keys(data[0]).filter(function(key) { return key !== "age_group" && key !== 'total' && key !== 'num_replies'; });

var ageCounts = [];
      data.forEach(function(d){
        ageCounts.push({'agegroup': d.age_group, 'num': d.num_replies});
      });

data.forEach(function(d) {
        d.ages = ageNames.map(function(name) { return {name: name, value: +d[name]}; });
        // console.log(d.ages);
      });

x0.domain(data.map(function(d) { return d.age_group; }));
      x1.domain(ageNames).rangeRoundBands([0, x0.rangeBand()]);
      y.domain([0, d3.max(data, function(d) { return d3.max(d.ages, function(d) { return d.value; }); })]);

svg.append("g")
          .attr("class", "x axis")
          .attr("transform", "translate(0," + height + ")")
          .call(xAxis)
          .append("text")
          .attr("y", 30)
          .attr("x", width/2)
          .style("text-anchor", "middle")
          .text("Age Groups");

svg.append("g")
          .attr("class", "y axis")
          .call(yAxis)
        .append("text")
          .attr("transform", "rotate(-90)")
          .attr("y", 6)
          .attr("dy", ".71em")
          .style("text-anchor", "end")
          .text("Average Number of Communications");

var xgroup = svg.selectAll(".xgroup")
          .data(data)
        .enter().append("g")
          .attr("class", "g")
          .attr("transform", function(d) { return "translate(" + x0(d.age_group) + ",0)"; });

xgroup.selectAll("rect")
          .data(function(d) { return d.ages; })
        .enter().append("rect")
          .attr("width", x1.rangeBand())
          .attr("x", function(d) { return x1(d.name); })
          .attr("y", function(d) { return y(d.value); })
          .attr("height", function(d) { return height - y(d.value); })
          .style("fill", function(d) { return color(d.name); });

var legend = svg.selectAll(".legend")
          .data(ageNames.slice().reverse())
        .enter().append("g")
          .attr("class", "legend")
          .attr("transform", function(d, i) { return "translate(-20," + i * 20 + ")"; });

legend.append("rect")
          .attr("x", width - 18)
          .attr("width", 18)
          .attr("height", 18)
          .style("fill", color);

legend.append("text")
          .attr("x", width - 24)
          .attr("y", 9)
          .attr("dy", ".35em")
          .style("text-anchor", "end")
          .text(function(d) { return d; });

// for N values
      var legend2group = svg.append("g")
        .attr('transform', function(){return 'translate(' + (-600) +','+ (height+30) + ')'})
      var legend2 = legend2group.selectAll(".legend2")
          .data(ageCounts)
        .enter().append("g")
          .attr("class", "legend2")
          .attr("transform", function(d, i) { return "translate(" + (i*100)  +"," + 10 + ")"; });

legend2.append("text")
          .attr("x", width - 24)
          .attr("y", 2)
          .attr("dy", ".35em")
          .style("text-anchor", "end")
          .text(function(d) { return d.agegroup + ": "; });

legend2.append("text")
          .attr("x", width - 16)
          .attr("y", 2)
          .attr("dy", ".35em")
          .style("text-anchor", "start")
          .text(function(d) { return ' N = ' + d.num;});

}

d3.csv("convoSummary.csv", function(error, data) {
      if (error) throw error;
       
      var targSVG = "#chart";
      groupedBarChart(data, targSVG, w, h, pad, colors);
});

var init = function()
{
    var mychart = d3.select("#myChart")
        .append("div")
        .classed("svg-container", true) //container class to make it responsive
        .append("svg")
       // responsive SVG needs these 2 attributes and no width and height attr
        .attr("preserveAspectRatio", "xMinYMin meet")
        .attr("viewBox", "0 0 850 450")
        //class to make it responsive
        .classed("svg-content-responsive", true)
        .attr("id", "chart");          
    
}

init();

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</body>

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

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