statespace
method
SARIMAXResults.
cov_params_oim
(array) The variance / covariance matrix. Computed using the method from Harvey (1989).
statsmodels.tsa.statespace.sarimax.SARIMAXResults.cov_params_approx
statsmodels.tsa.statespace.sarimax.SARIMAXResults.cov_params_opg