D3 Examples - Homicide vs life satisfaction

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        <title>Homicide vs life satisfaction</title>
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            body {
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        <h1>Homicide rate vs life satisfaction score in OECD countries </h1>
        <p>Homicide rate on the horizontal axis, life satisfaction score on the vertical axis. Data from <a href="https://www.oecdbetterlifeindex.org/about/better-life-initiative/">OECD</a>.</p>
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        <script type="text/javascript"> 
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            // Define height and width of SVG box
            var w = 600;
            var h = 500;
            var padding = [ 30, 20, 40, 40 ];  // Paading 0 top, 1 right, 2 bottom, 3 left
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            // Create scale pixel range for width
            var xScale = d3.scale.linear()
                                .range([ padding[3], w - padding[1] ]);
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            // Create scale pixel range for height, and percentage gap
            var yScale = d3.scale.linear()
                                .range([ padding[0], h - padding[2]
                                    ]);
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            // Create x axis at the bottom
            var xAxis = d3.svg.axis()
                            .scale(xScale)
                            .orient("bottom")
                            .ticks(12);
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            // Create y axis to the left
            var yAxis = d3.svg.axis()
                            .scale(yScale)
                            .ticks(8)
                            .orient("left");
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            // Create SVG with right height and width
            var svg = d3.select("body")
                        .append("svg")
                        .attr("width", w)
                        .attr("height", h);
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            // Import data from file
            d3.csv("oecd.csv", function(data) {
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                // Sort data
                data.sort(function(a, b) {
                    return d3.descending(+a.homicide, +b.homicide);
                }); 
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                // Set domain (input range) for x scale 
                xScale.domain([ 0, d3.max(data, function(d) 
                        {return +d.homicide;})
                    ]);
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                // Set domain (input range) for y scale 
                yScale.domain([ d3.max(data, function(d) {return +d.satisfaction;}), 
                    d3.min(data, function(d) {return +d.satisfaction;}) 
                ]);
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                // create circles
                var circles = svg.selectAll("circle")
                    .data(data)
                    .enter()
                    .append("circle")
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                // Set attributes for circles, initial state
                circles.attr("cx", padding[3])
                    .attr("cy", h - padding[2])
                    .attr("r", 5)
                    .attr("fill", "#ffffff")
                    .append("title")
                    .text(function(d) {
                        return d.country + "'s satisfaction rate: " + d.satisfaction + " % and homicide rate: " + d.homicide ;
                    });
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                // Set new attributes for transition
                circles.sort(function(a, b) {
                        return d3.ascending(+a.homicide, +b.homicide);
                    })
                    .transition()
                    // Delay in ms pr item
                    .delay(function(d, i) {
                        return i * 50;
                    })
                    .duration(1000)
                    .attr("fill", "#65c8d0")
                    .attr("cx", function(d){
                        return xScale(d.homicide);
                    })
                    .attr("cy", function(d) {
                        return yScale(d.satisfaction);
                    })
                    ;
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                // Append x axis as group, translate
                svg.append("g")
                    .attr("class", "x axis")
                    .attr("transform", "translate(0" + "," + (h - padding[2]) + ")")
                    .call(xAxis);
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                // Append y axis as group, translate
                svg.append("g")
                    .attr("class", "y axis")
                    .attr("transform", "translate(" + padding[3] + ",0)")
                    .call(yAxis);
            });
        </script>
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