{
  "title": "Subtract the control-region change from a before-and-after result",
  "synthetic": true,
  "inputs": {
    "tb": 100,
    "ta": 140,
    "cb": 80,
    "ca": 100
  },
  "outputs": [
    {
      "label": "Treatment change",
      "actual": 40,
      "expected": 40,
      "passed": true
    },
    {
      "label": "Control change",
      "actual": 20,
      "expected": 20,
      "passed": true
    },
    {
      "label": "Additive contrast",
      "actual": 20,
      "expected": 20,
      "passed": true
    }
  ],
  "constraints": [],
  "formulas": [
    {
      "label": "Treatment change",
      "javascript": "v.ta-v.tb"
    },
    {
      "label": "Control change",
      "javascript": "v.ca-v.cb"
    },
    {
      "label": "Additive contrast",
      "javascript": "(v.ta-v.tb)-(v.ca-v.cb)"
    }
  ],
  "limits": "This is an unnormalised count model. Unequal scale, changing population, pre-trend differences and interference between regions need a more appropriate design before the result informs a causal budget decision."
}