{
  "n_total": 3199,
  "n_attributed": 688,
  "n_unattributed": 2511,
  "fraction_attributed": 0.2151,
  "tests": [
    {
      "test": "chi-squared",
      "dimension": "backbone",
      "chi2": 37.731687006347215,
      "p_value": 3.4076233773952626e-06,
      "dof": 7,
      "cramers_v": 0.1086,
      "n_attributed": 688,
      "n_unattributed": 2511,
      "proportions_attributed": {
        "DINOv2": 0.016,
        "DINOv3-B": 0.2078,
        "DINOv3-L": 0.0538,
        "Multi-Backbone": 0.0218,
        "Other": 0.0015,
        "SigLIP2": 0.0363,
        "VJepa2": 0.6628,
        "_Other_merged": 0.0
      },
      "proportions_unattributed": {
        "DINOv2": 0.055,
        "DINOv3-B": 0.1876,
        "DINOv3-L": 0.0693,
        "Multi-Backbone": 0.0115,
        "Other": 0.01,
        "SigLIP2": 0.0191,
        "VJepa2": 0.6464,
        "_Other_merged": 0.0012
      },
      "significant_at_005": true,
      "bonferroni_significant": true
    },
    {
      "test": "chi-squared",
      "dimension": "encoder",
      "chi2": 61.185393113414705,
      "p_value": 1.6343587596346454e-12,
      "dof": 4,
      "cramers_v": 0.1383,
      "n_attributed": 688,
      "n_unattributed": 2511,
      "proportions_attributed": {
        "BiMamba": 0.1541,
        "Hybrid R-M": 0.0451,
        "Retention": 0.1483,
        "Zipformer": 0.6526,
        "_Other_merged": 0.0
      },
      "proportions_unattributed": {
        "BiMamba": 0.0844,
        "Hybrid R-M": 0.0267,
        "Retention": 0.0948,
        "Zipformer": 0.7937,
        "_Other_merged": 0.0004
      },
      "significant_at_005": true,
      "bonferroni_significant": true
    },
    {
      "test": "KS",
      "dimension": "average_precision",
      "ks_statistic": 0.12486555151694978,
      "p_value": 7.526837497923383e-05,
      "n_attributed": 544,
      "n_unattributed": 793,
      "mean_attributed": 0.5898954336663079,
      "mean_unattributed": 0.5252813910994497,
      "median_attributed": 0.7680604382121345,
      "median_unattributed": 0.6903174706953216,
      "std_attributed": 0.31423275759452013,
      "std_unattributed": 0.32724773275568475,
      "significant_at_005": true,
      "bonferroni_significant": true
    },
    {
      "test": "KS",
      "dimension": "temporal_position",
      "ks_statistic": 0.5917960971724413,
      "p_value": 1.4487266447307843e-177,
      "n_attributed": 688,
      "n_unattributed": 2511,
      "mean_attributed": 2291.9622093023254,
      "mean_unattributed": 1409.132218239745,
      "median_attributed": 2288.5,
      "median_unattributed": 1255.0,
      "std_attributed": 447.9487145839851,
      "std_unattributed": 929.441921791293,
      "significant_at_005": true,
      "temporal_characterization": {
        "attributed_quartile_counts": [
          0,
          50,
          339,
          299
        ],
        "unattributed_quartile_counts": [
          800,
          750,
          461,
          500
        ],
        "attributed_quartile_fracs": [
          0.0,
          0.0727,
          0.4927,
          0.4346
        ],
        "unattributed_quartile_fracs": [
          0.3186,
          0.2987,
          0.1836,
          0.1991
        ],
        "note": "Quartiles Q1-Q4 of campaign timeline (early to late)"
      },
      "bonferroni_significant": true
    }
  ],
  "stratified_tests": [
    {
      "test": "chi-squared",
      "dimension": "backbone_stratified",
      "chi2": 16.938753126943872,
      "p_value": 0.009510990909807603,
      "dof": 6,
      "cramers_v": 0.1029,
      "n_attributed": 638,
      "n_unattributed": 961,
      "proportions_attributed": {
        "DINOv2": 0.0094,
        "DINOv3-B": 0.1959,
        "DINOv3-L": 0.0188,
        "Multi-Backbone": 0.0235,
        "SigLIP2": 0.0361,
        "VJepa2": 0.7147,
        "_Other_merged": 0.0016
      },
      "proportions_unattributed": {
        "DINOv2": 0.0198,
        "DINOv3-B": 0.2653,
        "DINOv3-L": 0.0166,
        "Multi-Backbone": 0.0302,
        "SigLIP2": 0.0281,
        "VJepa2": 0.6348,
        "_Other_merged": 0.0052
      },
      "significant_at_005": true,
      "bonferroni_significant": true
    },
    {
      "test": "chi-squared",
      "dimension": "encoder_stratified",
      "chi2": 2.5736596283029294,
      "p_value": 0.46212607800608874,
      "dof": 3,
      "cramers_v": 0.0401,
      "n_attributed": 638,
      "n_unattributed": 961,
      "proportions_attributed": {
        "BiMamba": 0.1583,
        "Hybrid R-M": 0.0486,
        "Retention": 0.1254,
        "Zipformer": 0.6677
      },
      "proportions_unattributed": {
        "BiMamba": 0.1478,
        "Hybrid R-M": 0.0635,
        "Retention": 0.1103,
        "Zipformer": 0.6785
      },
      "significant_at_005": false,
      "bonferroni_significant": false
    },
    {
      "test": "KS",
      "dimension": "average_precision_stratified",
      "ks_statistic": 0.11336723032842544,
      "p_value": 0.0008959531124464975,
      "n_attributed": 499,
      "n_unattributed": 726,
      "mean_attributed": 0.598750591386905,
      "mean_unattributed": 0.5406952754875529,
      "median_attributed": 0.7764133443267354,
      "median_unattributed": 0.7386060814373168,
      "std_attributed": 0.3134688752302441,
      "std_unattributed": 0.32817339302154075,
      "significant_at_005": true,
      "bonferroni_significant": true
    }
  ],
  "stratified_summary": {
    "temporal_window": "second_half (experiments 1600-3199)",
    "n_attributed_in_window": 638,
    "n_unattributed_in_window": 961,
    "n_tests": 3,
    "n_significant_bonferroni": 2,
    "max_effect_size": 0.1134,
    "verdict": "DISTINGUISHABLE"
  },
  "summary": {
    "n_tests": 4,
    "n_significant_nominal": 4,
    "n_significant_bonferroni": 4,
    "max_effect_size": 0.5918,
    "verdict": "DISTINGUISHABLE",
    "interpretation": "4/4 tests significant after Bonferroni correction with max effect size 0.5918. The attributed subset shows meaningful differences from the unattributed population \u2014 see individual test details."
  }
}