statsmodels.stats.sandwich_covariance.cov_cluster
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statsmodels.stats.sandwich_covariance.cov_cluster(results, group, use_correction=True)
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cluster robust covariance matrix
Calculates sandwich covariance matrix for a single cluster, i.e. grouped variables.
Parameters: results : result instance
result of a regression, uses results.model.exog and results.resid TODO: this should use wexog instead
use_correction : bool
If true (default), then the small sample correction factor is used.
Returns: cov : ndarray, (k_vars, k_vars)
cluster robust covariance matrix for parameter estimates
Notes
same result as Stata in UCLA example and same as Peterson
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