{
"test_name": "Harvey-Collier Test (Python - statsmodels)",
"dataset": "longley",
"formula": "GNP.deflator ~ GNP + Unemployed + Armed Forces + Population + Year + Employed",
"statistic": null,
"p_value": null,
"passed": null,
"skipped": true,
"reason": "Test returned NaN values - likely due to multicollinearity in the data",
"description": "Tests for functional form misspecification by examining whether recursive residuals exhibit a linear trend. Uses statsmodels.stats.diagnostic.linear_harvey_collier."
}