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  ],
  "models": [
    {
      "key": "linear",
      "label": "Linear trend",
      "formula": "ŷ(t+h) = yₜ + βh",
      "weight": 0.2062,
      "backtestMae": 49.7,
      "backtestSmape": 15,
      "parameters": {
        "dailySlope": 3.1079
      },
      "usersAtOneYear": 1645,
      "usersAtTwoYears": 2780
    },
    {
      "key": "power",
      "label": "Power curve",
      "formula": "ŷ(t) = a(t+c)ᵇ",
      "weight": 0.7511,
      "backtestMae": 26,
      "backtestSmape": 7.5,
      "parameters": {
        "exponent": 1.1853,
        "shiftDays": 1
      },
      "usersAtOneYear": 2243,
      "usersAtTwoYears": 4245
    },
    {
      "key": "gompertz",
      "label": "Gompertz S-curve",
      "formula": "ŷ(t) = K·exp(−exp(a−bt))",
      "weight": 0.0427,
      "backtestMae": 109.1,
      "backtestSmape": 41.6,
      "parameters": {
        "carryingCapacity": 1008.0025,
        "growthRate": 0.012
      },
      "usersAtOneYear": 1000,
      "usersAtTwoYears": 1008
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  ],
  "method": {
    "ensemble": "Inverse-squared-MAE weighted ensemble",
    "validation": "Rolling-origin holdouts of 30, 60 and 90 days",
    "interval": "Scenario envelope: minimum and maximum of the three model forecasts",
    "caveat": "A scenario range, not a confidence interval. Long-range extension growth depends on product, distribution and Chrome Web Store conditions that this time series cannot observe."
  }
}