Description Usage Arguments Details Value

Extract and return the variance-covariance matrix.

1 2 3 4 |

`object` |
a fitted model object |

`complete` |
logical indicating if the full variance-covariance
matrix should be returned. This has an effect only for an
over-determined fit where some of the coefficients are undefined,
and |

`...` |
additional arguments for method functions |

For the `coxph`

and `survreg`

functions the returned matrix
is a particular generalized inverse: the row and column corresponding
to any NA coefficients will be zero. This is a side effect of the
generalized cholesky decomposion used in the unerlying compuatation.

a matrix

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