{
"test_name": "Rainbow Test (Python - statsmodels)",
"dataset": "synthetic_small",
"formula": "x ~ y",
"statistic": 1.0798460550944156,
"p_value": 0.48876179542004516,
"passed": true,
"fraction": 0.5,
"description": "Tests for linearity by comparing fit on central subset vs full data. Uses statsmodels.stats.diagnostic.linear_rainbow."
}