{
  "schemaVersion": 1,
  "title": "Can the method recover a known beginning?",
  "scope": {
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    "tips": 47,
    "primaryTraits": 93,
    "tree": "Cosmic-derived topology and branch lengths",
    "missingness": "Exact five-cell source mask for primary controlled and null datasets",
    "model": "Two-state reversible transitions with a potentially non-equilibrium root frequency",
    "signalDefinition": "logit(root presence frequency) − logit(equilibrium presence frequency)",
    "rootPanel": "12 preselected roots, 50 histories per root and signal; each root equally weighted",
    "recoveryDefinition": "Generating split is the only winning edge within 1e-6 log likelihood; reconstruction losses included",
    "nullDefinition": "Root and equilibrium frequencies equal; no identifiable true root",
    "limitations": "Model-conditional recovery, not validation of an ancient geographical origin. Neither proves an alternative homeland nor disproves Africa. Stress and larger-matrix panels are secondary."
  },
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    "datasets": 400,
    "rate": 0.965,
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    "knownUniqueBest": 389,
    "knownFits": 400,
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  "largerMatrix": {
    "primaryTraits": 93,
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    "design": "Independent unpaired samples, 50 per size in each cell",
    "interpretation": "All four point estimates increase; every Newcombe 95% interval crosses zero",
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  "provenance": {
    "acceptance": "Accepted for stated model-recovery claims; final production acceptance",
    "sourceProject": "root_recovery_2026",
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    "audit": "All 4,600 flattened records reconciled to raw likelihoods and recovery metrics; null thresholds, 20 recovery cells, 21 paired stress contrasts and 4 unpaired site-count contrasts independently reproduced",
    "optimizerSensitivity": "37 selected-edge termination flags resolved by deterministic successful continuations; all selected edges retained; frozen production scores unchanged",
    "exporter": "scripts/build-myth-calibration-summary.py",
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}