{
"test_name": "Rainbow Test (Python - statsmodels)",
"dataset": "synthetic_nonlinear",
"formula": "x ~ y",
"statistic": 14.800268590285166,
"p_value": 5.178423869308479e-17,
"passed": false,
"fraction": 0.5,
"description": "Tests for linearity by comparing fit on central subset vs full data. Uses statsmodels.stats.diagnostic.linear_rainbow."
}