{
"test_name": "Harvey-Collier Test (Python - statsmodels)",
"dataset": "ToothGrowth",
"formula": "len ~ supp + dose",
"statistic": null,
"p_value": null,
"passed": null,
"skipped": true,
"reason": "High multicollinearity detected - Harvey-Collier test requires full-rank design matrix. Consider using VIF to diagnose multicollinearity first.",
"description": "Tests for functional form misspecification by examining whether recursive residuals exhibit a linear trend. Uses statsmodels.stats.diagnostic.linear_harvey_collier."
}