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The Statsmodels skill equips Claude with specialized expertise in Python's premier library for statistical modeling, inference, and diagnostics. It provides structured guidance for fitting linear and generalized linear models, conducting time-series forecasting with ARIMA/SARIMAX, and executing complex hypothesis tests. Whether you are conducting econometric research, validating model assumptions through residual diagnostics, or generating publication-quality summary tables, this skill ensures mathematically sound implementations and accurate interpretation of statistical metrics like AIC, BIC, and p-values.