Access standardized residuals, cook's values, hatvalues (leverage) etc. easily in Python?

Question

I am looking for influence statistics after fitting a linear regression. In R I can obtain them (e.g.) like this:

hatvalues(fitted_model) #hatvalues (leverage)
c         


        

Answer 1

Although the accepted answer is correct, I found it helpful to separately access the statistics as instance attributes of an influence instance (statsmodels.regression.linear_model.OLSResults.get_influence) after I fit my model. This saved me from having to index the summary_frame as I was only interested in one of the statistics and not all of them. So maybe this helps somebody else:

import statsmodels.api as sm

#Fit linear model to any dataset
model = sm.OLS(Y,X)
results = model.fit()

#create instance of influence
influence = results.get_influence()

#leverage (hat values)
leverage = influence.hat_matrix_diag

#Cook's D values (and p-values) as tuple of arrays
cooks_d = influence.cooks_distance

#standardized residuals
standardized_residuals = influence.resid_studentized_internal

#studentized residuals
studentized_residuals = influence.resid_studentized_external

Answer 2

I found it here:

http://www.statsmodels.org/dev/generated/statsmodels.stats.outliers_influence.OLSInfluence.summary_frame.html

OLSInfluence.summary_frame()