statsmodels.stats.sandwich_covariance.cov_white_simple(results, use_correction=True) [source]

heteroscedasticity robust covariance matrix (White)

Parameters: results (result instance) – result of a regression, uses results.model.exog and results.resid TODO: this should use wexog instead
Returns: cov – heteroscedasticity robust covariance matrix for parameter estimates
Return type: ndarray, (k_vars, k_vars)


This produces the same result as cov_hc0, and does not include any small sample correction.

verified (against LinearRegressionResults and Peterson)

See also

cov_hc1, cov_hc2, cov_hc3

© 2009–2012 Statsmodels Developers
© 2006–2008 Scipy Developers
© 2006 Jonathan E. Taylor
Licensed under the 3-clause BSD License.