Chart3.json

{
  "$schema": "https://vega.github.io/schema/vega-lite/v5.json",
  "title": "Heatmap of Correlation Matrix",
  "width": 400,
  "height": 300,
  "data": {
    "url": "https://raw.githubusercontent.com/sz0314/life_expansion/main/correlation_matrix.csv"
  },
  "layer": [
    {
      "mark": {"type": "rect", "tooltip": true},
      "encoding": {
        "x": {"field": "row", "type": "nominal", "axis": {"title": null}},
        "y": {"field": "col", "type": "nominal", "axis": {"title": null}},
        "color": {"field": "value", "type": "quantitative", "title": null}
      }
    },
    {
      "mark": {
        "type": "text",
        "align": "center",
        "baseline": "middle",
        "fontSize": 10,
        "color": "black",
        "tooltip": true
      },
      "encoding": {
        "x": {"field": "row", "type": "nominal"},
        "y": {"field": "col", "type": "nominal"},
        "text": {"field": "value", "type": "quantitative", "format": ".2f"}
      }
    }
  ],
  "config": {"mark": {"tooltip": null}}
}