{
  "version": "1.2",
  "units": {
    "iv_mean": "annualized percent volatility",
    "rvf_mean": "annualized percent volatility",
    "vrp_post_mean": "volatility points",
    "var_post_mean": "volatility-points squared",
    "mse": "squared volatility points",
    "rmse": "volatility points",
    "mse_gain_pct": "percent of IV-only observed MSE; positive means lower error",
    "oos_r2_vs_mean": "1-model SSE / expanding-mean SSE on identical origins",
    "loss_share": "magnitude of summed negative variance differences / summed positive differences; overlapping, not portfolio returns"
  },
  "figure_files": {
    "figure-2.csv": "Original marginal correlations and spread regression",
    "figure-3.csv": "Paired joint versus IV-only MSE improvement and normalized pointwise intervals",
    "figure-4.csv": "Pooled deciles; descriptive",
    "figure-5.csv": "Per-symbol descriptive statistics",
    "figure-6.csv": "Statistics by origin year, not annual investment performance",
    "figure-7.csv": "Histogram counts; first/last bins fold extreme observations at plot boundaries",
    "figure-8.csv": "Corrected tercile test"
  },
  "raw_inputs": {
    "benchmark": "date-indexed *_inputs.csv: iv30 decimal annualized ATM IV; total_rv decimal daily intraday+overnight variance; quality flags excluded",
    "yahoo": "date-indexed split-adjusted regular-session OHLC, not dividend-adjusted"
  },
  "full_methods": "methods.txt",
  "column_definitions": "Code and results.json include the exact model definitions, input audits, sample stages and uncertainty estimators."
}