statespace
method
SARIMAXResults.
cov_params_opg
(array) The variance / covariance matrix. Computed using the outer product of gradients method.
statsmodels.tsa.statespace.sarimax.SARIMAXResults.cov_params_oim
statsmodels.tsa.statespace.sarimax.SARIMAXResults.cov_params_robust