{
  "kind": "stacked-variance",
  "title": "Noise and disagreement are different quantities",
  "description": "At states 0, 0.5, and 2, stack within variance 0.04 with between variance 0, 0.006667, and 0.106667. A separate counterexample panel shows zero disagreement despite nonzero error.",
  "data": {
    "provenance": "Computed from the executed local Python illustration. Synthetic inputs and assumptions; not paper benchmark results or production measurements.",
    "panels": [
      {
        "title": "Variance decomposition",
        "x_label": "State",
        "x_unit": "state units",
        "y_label": "Predictive variance",
        "y_unit": "squared state units",
        "series": [
          {
            "name": "within-model",
            "x": [
              0.0,
              0.5,
              2.0
            ],
            "y": [
              0.04,
              0.04,
              0.04
            ]
          },
          {
            "name": "between-model",
            "x": [
              0.0,
              0.5,
              2.0
            ],
            "y": [
              0.0,
              0.006666666666666664,
              0.10666666666666662
            ]
          }
        ],
        "chart": "stacked-bar"
      },
      {
        "title": "Shared-bias error",
        "x_label": "State",
        "x_unit": "state units",
        "y_label": "Absolute mean error",
        "y_unit": "state units",
        "series": [
          {
            "name": "identical slope-one models",
            "x": [
              0.0,
              0.5,
              2.0
            ],
            "y": [
              0.0,
              0.125,
              2.0
            ]
          }
        ],
        "annotation": "Between-model variance is zero at every point in this second panel."
      }
    ]
  }
}