Scatter Plot

<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
    .chart {
      background: lightgray;
      border: 1px solid black;
    }
  </style>
</head>

<body>
  <div class="chart"></div>
  <script>
		var margin = { top: 10, right: 10, bottom: 25, left: 25}
    var width = 425 - margin.left - margin.right;
    var height = 625 - margin.top - margin.bottom;
    var svg = d3.select('.chart')
    	.append('svg')
        .attr('width', width + margin.left + margin.right)
        .attr('height', height + margin.top + margin.bottom)
    	.call(responsivefy)
      .append('g')
        .attr('transform', `translate(${margin.left}, ${margin.top})`)

var data = [
  {
    "country": "United States",
    "population": 323050000,
    "expectancy": 78.94,
    "cost": 9024.21,
    "code": "US"
  },
  {
    "country": "Switzerland",
    "population": 8306200,
    "expectancy": 82.85,
    "cost": 6786.57,
    "code": "CH"
  },
  {
    "country": "Norway",
    "population": 5213985,
    "expectancy": 81.75,
    "cost": 6081,
    "code": "NO"
  },
  {
    "country": "Netherlands",
    "population": 16998003,
    "expectancy": 81.3,
    "cost": 5276.6,
    "code": "NL"
  },
  {
    "country": "Germany",
    "population": 81459000,
    "expectancy": 80.84,
    "cost": 5119.21,
    "code": "DE"
  },
  {
    "country": "Sweden",
    "population": 9858794,
    "expectancy": 81.96,
    "cost": 5065.16,
    "code": "SE"
  },
  {
    "country": "Ireland",
    "population": 4635400,
    "expectancy": 81.15,
    "cost": 5001.32,
    "code": "IE"
  },
  {
    "country": "Austria",
    "population": 8699730,
    "expectancy": 81.34,
    "cost": 4896,
    "code": "AT"
  },
  {
    "country": "Denmark",
    "population": 5707251,
    "expectancy": 80.55,
    "cost": 4857.03,
    "code": "DK"
  },
  {
    "country": "Belgium",
    "population": 11306030,
    "expectancy": 80.59,
    "cost": 4522.04,
    "code": "BE"
  },
  {
    "country": "Canada",
    "population": 35985751,
    "expectancy": 81.96,
    "cost": 4495.69,
    "code": "CA"
  },
  {
    "country": "Luxembourg",
    "population": 562,
    "expectancy": 82.21,
    "cost": 4478.97,
    "code": "LU"
  },
  {
    "country": "France",
    "population": 64513242,
    "expectancy": 82.37,
    "cost": 4366.99,
    "code": "FR"
  },
  {
    "country": "Australia",
    "population": 24026900,
    "expectancy": 82.25,
    "cost": 4206.85,
    "code": "AU"
  },
  {
    "country": "Japan",
    "population": 126810000,
    "expectancy": 83.59,
    "cost": 4152.37,
    "code": "JP"
  },
  {
    "country": "United Kingdom",
    "population": 65097000,
    "expectancy": 81.06,
    "cost": 3971.39,
    "code": "UK"
  },
  {
    "country": "Iceland",
    "population": 332,
    "expectancy": 82.06,
    "cost": 3896.93,
    "code": "IS"
  },
  {
    "country": "Finland",
    "population": 5490750,
    "expectancy": 81.13,
    "cost": 3871.39,
    "code": "FI"
  },
  {
    "country": "New Zealand",
    "population": 4671020,
    "expectancy": 81.4,
    "cost": 3537.26,
    "code": "NZ"
  },
  {
    "country": "Italy",
    "population": 60676361,
    "expectancy": 82.69,
    "cost": 3206.83,
    "code": "IT"
  },
  {
    "country": "Spain",
    "population": 46423064,
    "expectancy": 83.08,
    "cost": 3053.07,
    "code": "ES"
  },
  {
    "country": "Slovenia",
    "population": 2069982,
    "expectancy": 80.52,
    "cost": 2598.91,
    "code": "SI"
  },
  {
    "country": "Portugal",
    "population": 10374822,
    "expectancy": 80.72,
    "cost": 2583.84,
    "code": "PT"
  },
  {
    "country": "Israel",
    "population": 8476600,
    "expectancy": 82.15,
    "cost": 2547.4,
    "code": "IL"
  },
  {
    "country": "Czech Republic",
    "population": 10546120,
    "expectancy": 78.28,
    "cost": 2386.34,
    "code": "CZ"
  },
  {
    "country": "South Korea",
    "population": 51555409,
    "expectancy": 82.16,
    "cost": 2361.44,
    "code": "KR"
  },
  {
    "country": "Greece",
    "population": 10846979,
    "expectancy": 81.29,
    "cost": 2220.11,
    "code": "GR"
  },
  {
    "country": "Slovakia",
    "population": 5424058,
    "expectancy": 76.71,
    "cost": 1970.52,
    "code": "SK"
  },
  {
    "country": "Hungary",
    "population": 9849000,
    "expectancy": 75.87,
    "cost": 1796.6,
    "code": "HU"
  },
  {
    "country": "Estonia",
    "population": 1311759,
    "expectancy": 77.24,
    "cost": 1724.51,
    "code": "EE"
  },
  {
    "country": "Lithuania",
    "population": 2881705,
    "expectancy": 73.97,
    "cost": 1720.84,
    "code": "LT"
  },
  {
    "country": "Chile",
    "population": 18191900,
    "expectancy": 81.5,
    "cost": 1688.52,
    "code": "CL"
  },
  {
    "country": "Poland",
    "population": 38484000,
    "expectancy": 77.25,
    "cost": 1624.87,
    "code": "PL"
  },
  {
    "country": "Costa Rica",
    "population": 4832234,
    "expectancy": 79.4,
    "cost": 1393.95,
    "code": "CR"
  },
  {
    "country": "Russia",
    "population": 146544710,
    "expectancy": 70.37,
    "cost": 1368.75,
    "code": "RU"
  },
  {
    "country": "Latvia",
    "population": 1968600,
    "expectancy": 74.19,
    "cost": 1295.01,
    "code": "LV"
  },
  {
    "country": "South Africa",
    "population": 54956900,
    "expectancy": 57.18,
    "cost": 1146.47,
    "code": "ZA"
  },
  {
    "country": "Mexico",
    "population": 122273500,
    "expectancy": 76.72,
    "cost": 1052.66,
    "code": "MX"
  },
  {
    "country": "Turkey",
    "population": 78741053,
    "expectancy": 75.16,
    "cost": 990.19,
    "code": "TR"
  },
  {
    "country": "Colombia",
    "population": 48570200,
    "expectancy": 73.99,
    "cost": 964.5,
    "code": "CO"
  },
  {
    "country": "China",
    "population": 1375410000,
    "expectancy": 75.78,
    "cost": 730.52,
    "code": "CN"
  },
  {
    "country": "Indonesia",
    "population": 258705000,
    "expectancy": 68.89,
    "cost": 302.12,
    "code": "ID"
  },
  {
    "country": "India",
    "population": 1285930000,
    "expectancy": 68.01,
    "cost": 267.41,
    "code": "IN"
  }
]
    
		var yScale = d3.scaleLinear()
    	.domain(d3.extent(data, d => d.expectancy))
    	.range([height, 0])
    var yAxis = d3.axisLeft(yScale)
    svg.append('g')
    	.attr('transform', `translate(${margin.left}, ${margin.top})`)
    	.call(yAxis)
    
    var xScale = d3.scaleLinear()
    	.domain(d3.extent(data, d => d.cost))
    	.range([0, width])
    var xAxis = d3.axisBottom(xScale)
    	.ticks(5)
    svg.append('g')
    	.attr('transform', `translate(0, ${height})`)
    	.call(xAxis)
    
    var rScale = d3.scaleSqrt()
    	.domain([0, d3.max(data, d => d.population)])
    	.range([0, 40])
    
    var circles = svg.selectAll('.ball')
    	.data(data)
    	.enter()
    	.append('g')
    	.attr('class', 'ball')
    	.attr('transform', d => `translate(${xScale(d.cost)}, ${yScale(d.expectancy)})`)
		
    circles
      .append('circle')
        .attr('cx', 0)
        .attr('cy', 0)
        .attr('r', d => rScale(d.population))
        .style('fill-opacity', 0.5)
        .style('fill', 'steelblue')
    circles.append('text')
    		.style('text-anchor', 'middle')
    		.style('fill', 'black')
    		.attr('y', 4)
    		.attr('font-size', '11')
    		.text( d => d.code)
    
    function responsivefy(svg) {
      // get container + svg aspect ratio
      var container = d3.select(svg.node().parentNode),
          width = parseInt(svg.style("width")),
          height = parseInt(svg.style("height")),
          aspect = width / height;

// add viewBox and preserveAspectRatio properties,
      // and call resize so that svg resizes on inital page load
      svg.attr("viewBox", "0 0 " + width + " " + height)
          .attr("preserveAspectRatio", "xMinYMid")
          .call(resize);

// to register multiple listeners for same event type,
      // you need to add namespace, i.e., 'click.foo'
      // necessary if you call invoke this function for multiple svgs
      // api docs: https://github.com/mbostock/d3/wiki/Selections#on
      d3.select(window).on("resize." + container.attr("id"), resize);

// get width of container and resize svg to fit it
      function resize() {
          var targetWidth = parseInt(container.style("width"));
          svg.attr("width", targetWidth);
          svg.attr("height", Math.round(targetWidth / aspect));
      }
    }

</script>
</body>

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