{
  "$schema": "https://vega.github.io/schema/vega/v5.json",
  "description": "Relative frequency histogram. The data is binned with first transform. The number of values per bin and the total number are calculated in the second and third transform to calculate the relative frequency in the last transformation step.",
  "background": "white",
  "padding": 5,
  "width": 200,
  "height": 200,
  "style": "cell",
  "data": [
    {
      "name": "source_0",
      "url": "data/cars.json",
      "format": {"type": "json"},
      "transform": [
        {
          "type": "extent",
          "field": "Horsepower",
          "signal": "bin_maxbins_10_Horsepower_extent"
        },
        {
          "type": "bin",
          "field": "Horsepower",
          "as": ["bin_Horsepwoer", "bin_Horsepwoer_end"],
          "signal": "bin_maxbins_10_Horsepower_bins",
          "extent": {"signal": "bin_maxbins_10_Horsepower_extent"},
          "maxbins": 10
        },
        {
          "type": "aggregate",
          "groupby": ["bin_Horsepwoer", "bin_Horsepwoer_end"],
          "ops": ["count"],
          "fields": [null],
          "as": ["Count"]
        },
        {
          "type": "joinaggregate",
          "as": ["TotalCount"],
          "ops": ["sum"],
          "fields": ["Count"]
        },
        {
          "type": "formula",
          "expr": "datum.Count/datum.TotalCount",
          "as": "PercentOfTotal"
        },
        {
          "type": "stack",
          "groupby": ["bin_Horsepwoer", "bin_Horsepwoer"],
          "field": "PercentOfTotal",
          "sort": {"field": [], "order": []},
          "as": ["PercentOfTotal_start", "PercentOfTotal_end"],
          "offset": "zero"
        },
        {
          "type": "filter",
          "expr": "isValid(datum[\"bin_Horsepwoer\"]) && isFinite(+datum[\"bin_Horsepwoer\"]) && isValid(datum[\"PercentOfTotal\"]) && isFinite(+datum[\"PercentOfTotal\"])"
        }
      ]
    }
  ],
  "marks": [
    {
      "name": "marks",
      "type": "rect",
      "style": ["bar"],
      "from": {"data": "source_0"},
      "encode": {
        "update": {
          "tooltip": {
            "signal": "{\"Horsepower\": !isValid(datum[\"bin_Horsepwoer\"]) || !isFinite(+datum[\"bin_Horsepwoer\"]) ? \"null\" : format(datum[\"bin_Horsepwoer\"], \"\") + \" – \" + format(datum[\"bin_Horsepwoer_end\"], \"\"), \"Relative Frequency\": format(datum[\"PercentOfTotal\"], \".1~%\")}"
          },
          "fill": {"value": "#4c78a8"},
          "ariaRoleDescription": {"value": "bar"},
          "description": {
            "signal": "\"Horsepower: \" + (!isValid(datum[\"bin_Horsepwoer\"]) || !isFinite(+datum[\"bin_Horsepwoer\"]) ? \"null\" : format(datum[\"bin_Horsepwoer\"], \"\") + \" – \" + format(datum[\"bin_Horsepwoer_end\"], \"\")) + \"; Relative Frequency: \" + (format(datum[\"PercentOfTotal\"], \".1~%\"))"
          },
          "x2": {"scale": "x", "field": "bin_Horsepwoer", "offset": 1},
          "x": {"scale": "x", "field": "bin_Horsepwoer_end"},
          "y": {"scale": "y", "field": "PercentOfTotal_end"},
          "y2": {"scale": "y", "field": "PercentOfTotal_start"}
        }
      }
    }
  ],
  "scales": [
    {
      "name": "x",
      "type": "linear",
      "domain": {
        "data": "source_0",
        "fields": ["bin_Horsepwoer", "bin_Horsepwoer_end"]
      },
      "range": [0, {"signal": "width"}],
      "zero": false
    },
    {
      "name": "y",
      "type": "linear",
      "domain": {
        "data": "source_0",
        "fields": ["PercentOfTotal_start", "PercentOfTotal_end"]
      },
      "range": [{"signal": "height"}, 0],
      "nice": true,
      "zero": true
    }
  ],
  "axes": [
    {
      "scale": "y",
      "orient": "left",
      "gridScale": "x",
      "grid": true,
      "tickCount": {"signal": "ceil(height/40)"},
      "domain": false,
      "labels": false,
      "aria": false,
      "maxExtent": 0,
      "minExtent": 0,
      "ticks": false,
      "zindex": 0
    },
    {
      "scale": "x",
      "orient": "bottom",
      "grid": false,
      "title": "Horsepower",
      "labelFlush": true,
      "labelOverlap": true,
      "tickCount": {"signal": "ceil(width/40)"},
      "zindex": 0
    },
    {
      "scale": "y",
      "orient": "left",
      "grid": false,
      "title": "Relative Frequency",
      "format": ".1~%",
      "labelOverlap": true,
      "tickCount": {"signal": "ceil(height/40)"},
      "zindex": 0
    }
  ]
}