Scatter Plot (Vega)

{
  "$schema": "https://vega.github.io/schema/vega/v5.json",
  "description": "A scatter plot showing correlation between two variables.",
  "width": 400,
  "height": 200,
  "padding": 5,

  "data": [
    {
      "name": "table",
      "values": [
        {"x": 1, "y": 28},
        {"x": 2, "y": 55},
        {"x": 3, "y": 43},
        {"x": 4, "y": 91},
        {"x": 5, "y": 81},
        {"x": 6, "y": 53},
        {"x": 7, "y": 19},
        {"x": 8, "y": 87}
      ]
    }
  ],

  "scales": [
    {
      "name": "xscale",
      "type": "linear",
      "domain": {"data": "table", "field": "x"},
      "range": "width"
    },
    {
      "name": "yscale",
      "type": "linear",
      "domain": {"data": "table", "field": "y"},
      "nice": true,
      "range": "height"
    }
  ],

  "axes": [
    {"orient": "bottom", "scale": "xscale"},
    {"orient": "left", "scale": "yscale"}
  ],

  "marks": [
    {
      "type": "symbol",
      "from": {"data": "table"},
      "encode": {
        "enter": {
          "x": {"scale": "xscale", "field": "x"},
          "y": {"scale": "yscale", "field": "y"},
          "size": {"value": 100},
          "stroke": {"value": "steelblue"},
          "fill": {"value": "transparent"}
        },
        "update": {
          "fill": {"value": "steelblue"}
        },
        "hover": {
          "fill": {"value": "red"}
        }
      }
    }
  ]
}