This package is designed to produce variance-covariance matrices and standard errors as directly/efficiently as possible from fit models. Default methods (e.g., in `stats`

) tend to first compute the `summary`

object for a model, from which the matrix is extracted. The catch is that the `summary`

itself often involves several other extraneous computations. The `summary`

methods are typically fast for most purposes, but falter in this regard when a user wishes to compute standard errors of perhaps thousands of models (as may happen, for example, when bootstrapping).

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