D3 Examples - Investing in pensions

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        <title>Module 4 - Exercise</title>
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        body {
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<h1> <b> Investing in society (or investing in pensions?) </b> </h1>
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<p>Social expenditure in OECD countries in 2011 (as % of GDP) vs expenditure in pensions (as % of GDP). <a href="https://www.oecd-ilibrary.org/social-issues-migration-health/data/social-expenditure/aggregated-data_data-00166-en"> Explore the data </a> </p>
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        <script type="text/javascript">
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            var svg = d3.select("body")
                        .append("svg")
                        .attr("width", w)
                        .attr("height", h);
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            var xScale = d3.scale.linear()
                        .range([ padding[3], w - padding[1] - padding[3] ]);
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            var yScale = d3.scale.linear()
                        .range([ padding[0], h - padding[2] ]);
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            var xAxis = d3.svg.axis()
                        .scale(xScale)
                        .orient("bottom");
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            var yAxis = d3.svg.axis()
                        .scale(yScale)
                        .orient("left");
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            d3.csv("OECD_social.csv", function(data) {
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                data.sort(function(a, b) {
                    return d3.descending(+a.Total, +b.Total);
                });
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                xScale.domain([
                    0,
                    d3.max(data, function(d) {
                    return +d.Total;
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                    d3.max(data, function(d) {
                        return +d.Total;
                    }),
                    0
                ]);
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                                .data(data)
                                .enter()
                                .append("circle");
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                circles.attr("cx", function(d){
                        return xScale(d.Old)
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                    })
                    .attr("cy", function(d) {
                        return yScale(d.Total);
                    })
                    .attr("r", 5)
                    .attr("fill", "#d95f0e")
                    .append("title")
                    .text(function(d) {
                        return d.Country + "'s expenditure in pensions represents " + d.Old + "% of GDP " + "out of a total " + d.Total + "% of GDP devoted to social expenditure"
                    })
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                    svg.append("g")
                        .attr("class", "x axis")
                        .attr("transform", "translate(0," + (h - padding[2]) + ")")
                        .call(xAxis);
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                    svg.append("g")
                        .attr("class", "y axis")
                        .attr("transform", "translate(" + padding[3] + ",0)")
                        .call(yAxis);
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            });
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