{
  "data_type": "synthetic; no customer data",
  "seed": 20260907,
  "created": "2026-09-07",
  "unit": "synthetic sales index; not currency",
  "train_weeks": [
    1,
    32
  ],
  "test_weeks": [
    33,
    40
  ],
  "test_rows": 8,
  "model": "ordinary least squares: intercept + week + planned promotion",
  "coefficients": [
    121.33669340929646,
    1.5903450859534085,
    19.23226758651887
  ],
  "model_metrics": {
    "mae": 3.78,
    "wape_percent": 2.03
  },
  "baseline_metrics": {
    "mae": 9.59,
    "wape_percent": 5.14
  },
  "protocol": "Fixed model fitted only on weeks 1-32. One-week-ahead evaluation on weeks 33-40. Baseline uses the previous observed week, which is available at each forecast time. Promotion plan is assumed known before each week.",
  "limitations": [
    "Data deliberately contains a trend and promotion effect.",
    "One synthetic series and eight test observations cannot support a business performance claim.",
    "No hyperparameter selection or deployment to a customer system."
  ]
}