{
  "kind": "exploration_reference",
  "technique": "Cohort exploration",
  "location": "Explore > Cohort exploration template",
  "dimensions": [
    "Cohort (first visit date)"
  ],
  "metrics": [
    "Active users",
    "Sessions"
  ],
  "checkpoints": [
    "At least four weeks of data in range",
    "Cohort defined by first visit",
    "Metric chosen for the grid",
    "Cohorts compared in the same week column",
    "Retention period checked"
  ],
  "guide": "cohort-exploration-build",
  "title": "Build a cohort exploration: retention by the week users first arrived",
  "worked_example": {
    "rows": [
      {
        "cohort": "Week of 12 Oct",
        "users": 840,
        "returned_week_4": 252
      },
      {
        "cohort": "Week of 19 Oct",
        "users": 910,
        "returned_week_4": 291
      },
      {
        "cohort": "Week of 26 Oct",
        "users": 760,
        "returned_week_4": 190
      },
      {
        "cohort": "Week of 2 Nov",
        "users": 880,
        "returned_week_4": 308
      }
    ],
    "totals_recomputed": {
      "users": 3390,
      "returned": 1041,
      "retention": "30.7"
    }
  },
  "verification": "Figures recomputed in Python 3 with decimal arithmetic, 2026-11-11. No live GA4 run."
}