Bubble Plot (Gapminder)

{
  "$schema": "https://vega.github.io/schema/vega-lite/v2.json",
  "description": "A bubble plot showing the correlation between health and income for 187 countries in the world (modified from an example in Lisa Charlotte Rost's blog post 'One Chart, Twelve Charting Libraries' --http://lisacharlotterost.github.io/2016/05/17/one-chart-code/).",
  "width": 500,"height": 300,
  "data": {
    "url": "data/gapminder-health-income.csv"
  },
  "selection": {
    "view": {"type": "interval", "bind": "scales"}
  },
  "mark": "circle",
  "encoding": {
    "y": {
      "field": "health",
      "type": "quantitative",
      "scale": {"zero": false}
    },
    "x": {
      "field": "income",
      "type": "quantitative",
      "scale": {"type": "log"}
    },
    "size": {"field": "population","type": "quantitative"},
    "color": {"value": "#000"}
  }
}