Population Pyramid

A population pyramid for the US in 2000.

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Vega-Lite JSON Specification

{
  "$schema": "https://vega.github.io/schema/vega-lite/v3.json",
  "description": "A population pyramid for the US in 2000.",
  "data": { "url": "data/population.json"},
  "transform": [
    {"filter": "datum.year == 2000"},
    {"calculate": "datum.sex == 2 ? 'Female' : 'Male'", "as": "gender"}
  ],
  "spacing": 0,
  "hconcat": [{
    "transform": [{
      "filter": {"field": "gender", "equal": "Female"}
    }],
    "title": "Female",
    "mark": "bar",
    "encoding": {
      "y": {
        "field": "age", "type": "ordinal",
        "axis": null, "sort": "descending"
      },
      "x": {
        "aggregate": "sum", "field": "people", "type": "quantitative",
        "axis": {"title": "population", "format": "s"},
        "sort": "descending"
      },
      "color": {
        "field": "gender", "type": "nominal",
        "scale": {"range": ["#e377c2", "#1f77b4"]},
        "legend": null
      }
    }
  }, {
    "width": 20,
    "view": {"stroke": null},
    "mark": {
      "type": "text",
      "align": "center"
    },
    "encoding": {
      "y": {"field": "age", "type": "ordinal", "axis": null, "sort": "descending"},
      "text": {"field": "age", "type": "quantitative"}
    }
  }, {
    "transform": [{
      "filter": {"field": "gender", "equal": "Male"}
    }],
    "title": "Male",
    "mark": "bar",
    "encoding": {
      "y": {
        "field": "age", "type": "ordinal", "title": null,
        "axis": null, "sort": "descending"
      },
      "x": {
        "aggregate": "sum", "field": "people", "type": "quantitative",
        "axis": {"title": "population", "format": "s"}
      },
      "color": {
        "field": "gender", "type": "nominal",
        "legend": null
      }
    }
  }],
  "config": {
    "view": {"stroke": null},
    "axis": {"grid": false}
  }
}