{
  "$schema": "urn:prism:schema:v1:spec",
  "title": "Revenue by region x quarter, opacity = standardized deviation (significance shading)",
  "data": {
    "values": [
      {
        "region": "north",
        "quarter": "Q1",
        "revenue": 14000
      },
      {
        "region": "north",
        "quarter": "Q1",
        "revenue": 14450
      },
      {
        "region": "north",
        "quarter": "Q2",
        "revenue": 14800
      },
      {
        "region": "north",
        "quarter": "Q2",
        "revenue": 15250
      },
      {
        "region": "north",
        "quarter": "Q3",
        "revenue": 15600
      },
      {
        "region": "north",
        "quarter": "Q3",
        "revenue": 16050
      },
      {
        "region": "north",
        "quarter": "Q4",
        "revenue": 16400
      },
      {
        "region": "north",
        "quarter": "Q4",
        "revenue": 16850
      },
      {
        "region": "south",
        "quarter": "Q1",
        "revenue": 10880
      },
      {
        "region": "south",
        "quarter": "Q1",
        "revenue": 11330
      },
      {
        "region": "south",
        "quarter": "Q2",
        "revenue": 11680
      },
      {
        "region": "south",
        "quarter": "Q2",
        "revenue": 12130
      },
      {
        "region": "south",
        "quarter": "Q3",
        "revenue": 12480
      },
      {
        "region": "south",
        "quarter": "Q3",
        "revenue": 12930
      },
      {
        "region": "south",
        "quarter": "Q4",
        "revenue": 13280
      },
      {
        "region": "south",
        "quarter": "Q4",
        "revenue": 13730
      },
      {
        "region": "east",
        "quarter": "Q1",
        "revenue": 12260
      },
      {
        "region": "east",
        "quarter": "Q1",
        "revenue": 12710
      },
      {
        "region": "east",
        "quarter": "Q2",
        "revenue": 13060
      },
      {
        "region": "east",
        "quarter": "Q2",
        "revenue": 13510
      },
      {
        "region": "east",
        "quarter": "Q3",
        "revenue": 13860
      },
      {
        "region": "east",
        "quarter": "Q3",
        "revenue": 14310
      },
      {
        "region": "east",
        "quarter": "Q4",
        "revenue": 14660
      },
      {
        "region": "east",
        "quarter": "Q4",
        "revenue": 15110
      },
      {
        "region": "west",
        "quarter": "Q1",
        "revenue": 8640
      },
      {
        "region": "west",
        "quarter": "Q1",
        "revenue": 9090
      },
      {
        "region": "west",
        "quarter": "Q2",
        "revenue": 9440
      },
      {
        "region": "west",
        "quarter": "Q2",
        "revenue": 9890
      },
      {
        "region": "west",
        "quarter": "Q3",
        "revenue": 10240
      },
      {
        "region": "west",
        "quarter": "Q3",
        "revenue": 10690
      },
      {
        "region": "west",
        "quarter": "Q4",
        "revenue": 11040
      },
      {
        "region": "west",
        "quarter": "Q4",
        "revenue": 11490
      }
    ]
  },
  "transform": [
    {
      "crosstab": {
        "rows": [
          {
            "field": "region"
          }
        ],
        "columns": [
          {
            "field": "quarter"
          }
        ],
        "cell": {
          "aggregate": "sum",
          "field": "revenue",
          "as": "revenue"
        },
        "overlays": [
          {
            "kind": "zscore_vs_margin",
            "axis": "column",
            "as": "z"
          }
        ]
      }
    }
  ],
  "mark": "heatmap",
  "encoding": {
    "x": {
      "field": "quarter",
      "type": "nominal"
    },
    "y": {
      "field": "region",
      "type": "nominal"
    },
    "color": {
      "field": "revenue",
      "type": "quantitative"
    },
    "opacity": {
      "field": "z",
      "type": "quantitative"
    }
  }
}