{
"test_name": "Rainbow Test (Python - statsmodels)",
"dataset": "synthetic_interaction",
"formula": "x1 ~ x2 + y",
"statistic": 1.4011984821677665,
"p_value": 0.12296377859738646,
"passed": true,
"fraction": 0.5,
"description": "Tests for linearity by comparing fit on central subset vs full data. Uses statsmodels.stats.diagnostic.linear_rainbow."
}