Extract and return the variance-covariance matrix.
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a fitted model object
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,
additional arguments for method functions
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.
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