{
  "title": "Optifold website evidence snapshot",
  "verified_from_local_records": "2026-09-05",
  "primary": {
    "feature": "fraction_disorder_promoting",
    "residues": "ARGQSPEK",
    "threshold": 0.5641,
    "score": "negative disorder-promoting fraction",
    "development_auroc": 0.6891,
    "n": 81,
    "measurement_date": "2026-08-28",
    "source": "records/q1_feature_prespecification_v1.json, amendment_2"
  },
  "secondary": {
    "name": "weighted_hydropathy_disorder_v1",
    "auroc": 0.7584,
    "discordant_pairs": 6693,
    "estimator": "exhaustive leave-pair-out over all discordant pairs",
    "foldable": 97,
    "labels_are": "PROVISIONAL_UNRATIFIED at the time of freezing",
    "n": 166,
    "not_foldable": 69,
    "split": "amendment_4.development_set",
    "frozen_at": "2026-08-28T23:42:34Z",
    "refit_date": "2026-09-02T19:27:46Z",
    "refit_auroc": 0.7584,
    "source": "records/q1_feature_prespecification_v1.json, amendments_5 and _6",
    "formula": "0.67 * ((H + 0.344083) / 0.620907) + 0.33 * ((0.509481 - D) / 0.081716)",
    "hydropathy_definition": "Mean Kyte-Doolittle hydropathy over the full sequence",
    "disorder_definition": "Fraction of residues in ARGQSPEK; composition proxy, not predicted disorder regions",
    "hydropathy_weight": 0.67,
    "hydropathy_mean": -0.344083,
    "hydropathy_sd": 0.620907,
    "disorder_mean": 0.509481,
    "disorder_sd": 0.081716,
    "rounding": {
      "features_decimal_places": 4,
      "score_decimal_places": 6,
      "method": "Python round (nearest, ties to even) on binary floats"
    },
    "scaling_is": "Frozen development-set mean and standard deviation; do not refit to user input",
    "decision_threshold": null,
    "probability_calibration": null,
    "higher_scores": "Rank toward passing the tested reduced-MSA folding gate",
    "implementation": "tools/optifold.py: SECONDARY, gravy_hydropathy, secondary_score",
    "example_7SQG": {
      "length": 350,
      "disorder_count": 176,
      "H": -0.2009,
      "D": 0.5029,
      "score": 0.181081
    },
    "registration_status": "Named secondary model; the original primary analysis remains unchanged"
  },
  "limits": [
    "These are development estimates on different populations, not a head-to-head improvement claim.",
    "The labels remain provisional pending publication-grade scoring.",
    "NOT_FOLDABLE is restricted to the tested reduced-MSA AlphaFold2 configuration matrix.",
    "No confirmatory holdout result is presented."
  ]
}