# statsmodels.stats.outliers_influence.OLSInfluence.get_resid_studentized_external¶

OLSInfluence.get_resid_studentized_external(sigma=None)[source]

calculate studentized residuals

Parameters
sigma

estimate of the standard deviation of the residuals. If None, then the estimate from the regression results is used.

Returns
stzd_residndarray

studentized residuals

Notes

studentized residuals are defined as

resid / sigma / np.sqrt(1 - hii)


where resid are the residuals from the regression, sigma is an estimate of the standard deviation of the residuals, and hii is the diagonal of the hat_matrix.