{"library":"statsmodels","title":"statsmodels","type":"library","description":"statsmodels is a Python package offering a wide array of statistical models, hypothesis tests, and statistical data exploration tools. It provides classes and functions for the estimation of many different statistical models, including linear regression, generalized linear models, discrete choice models, and time series analysis. Currently at version 0.14.6, the library follows a loose, long time-based release cycle for its dependencies, typically updating minimal versions every one and a half to two years. 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Fit OLS (Ordinary Least Squares) model using R-style formula\n#    'y ~ x1 + C(x2)' means y is dependent on x1 and categorical x2\nmodel = smf.ols('y ~ x1 + C(x2)', data=df)\nresults = model.fit()\n\n# 3. Print the summary of the regression results\nprint(results.summary())","lang":"python","description":"This example demonstrates how to fit a simple Ordinary Least Squares (OLS) regression model using the R-style formula interface provided by `statsmodels.formula.api`. It shows creating sample data, defining the model with a formula, fitting it, and then printing a comprehensive summary of the results, including coefficients, R-squared, and various statistical tests. 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