{
  "dataset_version": "2026.10.1",
  "observations_through": "2026-09-30",
  "computed_on": "2026-10-03",
  "note": "A benchmark is only measured when MyQuotaBag holds the individual records behind it. Read the reproducibility field before citing.",
  "benchmarks": [
    {
      "benchmark_id": "MQB-BENCH-OFFER-RATIO-MEASURED",
      "metric": "prespend_ratio",
      "population_definition": "first-person public reports of an offer, each filed individually in the MyQuotaBag dataset, with one Purchase Ratio that counts",
      "research_pack_id": "MQB-DATASET-CANONICAL",
      "sample": {
        "n": 174
      },
      "statistics": {
        "median": 1.5,
        "p25": 1,
        "p75": 2,
        "minimum": 0,
        "maximum": 9
      },
      "quantile_method": "linear interpolation between closest ranks (Excel PERCENTILE.INC)",
      "distribution": {
        "lt_0_5": 8,
        "0_5_to_1_0": 8,
        "1_0_to_1_5": 67,
        "1_5_to_2_0": 31,
        "2_0_to_2_5": 34,
        "2_5_to_3_0": 21,
        "gt_3_0": 5
      },
      "ratio_sources": {
        "declared": 163,
        "recalculated": 11
      },
      "subgroups": {
        "first_quota_bag": {
          "n": 84,
          "median": 1.55,
          "p25": 1,
          "p75": 2
        },
        "later_quota_bag": {
          "n": 25
        },
        "rank_unknown": {
          "n": 65
        },
        "by_model": {
          "Birkin 25": {
            "n": 33,
            "median": 1.3,
            "p25": 1,
            "p75": 2
          },
          "Birkin 30": {
            "n": 27,
            "median": 1.25,
            "p25": 1,
            "p75": 2
          },
          "Kelly 25": {
            "n": 23,
            "median": 1.5,
            "p25": 1.1,
            "p75": 2
          },
          "Mini Kelly": {
            "n": 9,
            "minimum": 1.5,
            "maximum": 3
          },
          "Birkin 35": {
            "n": 5,
            "minimum": 0,
            "maximum": 1.84
          },
          "Shoulder Birkin": {
            "n": 4,
            "minimum": 0,
            "maximum": 2
          },
          "Kelly 28": {
            "n": 3,
            "minimum": 1.2,
            "maximum": 1.35
          },
          "Constance": {
            "n": 2
          }
        },
        "wait_months_first_offer": {
          "n": 67,
          "median": 6,
          "p25": 4,
          "p75": 10
        },
        "no_offer_yet": {
          "n": 28,
          "note": "collectors still waiting at the date of their report; counted, never part of the median"
        }
      },
      "sample_bias": [
        "self_selected_public_reports"
      ],
      "confidence": "medium_high",
      "sample_strength": "moderate",
      "traceability": "row-level; every report is kept in the MyQuotaBag research dataset and the figure is recomputed from those rows on every update",
      "reproducibility": "reproducible internally: recomputed on every build from the rows MyQuotaBag holds; the rows stay private to protect the people behind them",
      "production_use": "Primary Purchase Ratio benchmark. Cite with its n."
    }
  ],
  "observed_ranges": [
    {
      "range_id": "MQB-RANGE-NA-QB-2026-09",
      "topic_id": "north_america_ratio_band",
      "range": {
        "min": 1,
        "max": 2.5,
        "unit": "x target bag retail"
      },
      "meaning": "descriptive band for many recent North American first-QB narratives",
      "confidence": "medium_high",
      "not_a_threshold": true
    },
    {
      "range_id": "MQB-RANGE-CANADA-COMMUNITY-2026-09",
      "topic_id": "canada_ratio_estimate",
      "range": {
        "min": 1.5,
        "max": 3,
        "unit": "x target bag retail"
      },
      "meaning": "community estimate for Toronto/Vancouver competitive contexts",
      "confidence": "medium",
      "sample_strength": "limited",
      "not_a_benchmark": true
    },
    {
      "range_id": "MQB-RANGE-WAIT-COMPETITIVE-2026-09",
      "topic_id": "waiting_time_competitive",
      "range": {
        "min_months": 12,
        "max_months": 24
      },
      "meaning": "commonly reported range in competitive Canadian/top-US contexts for popular 25/MK",
      "confidence": "medium",
      "sample_strength": "limited",
      "not_a_median": true
    }
  ]
}