vcov method returns the variance-covariance matrix of the estimated regression coefficients from a WCE model.
Optional; other parameters to be passed through to
The function returns variance-covariance matrices with the estimated regression coefficients for the supplied WCE model object. The number of matrices returned is equivalent to the length of the
nknots vector (or one matrix, if
nknots is a scalar) passed to the
WCE function when fitting the model.
Sylvestre MP, Abrahamowicz M. Flexible modeling of the cumulative effects of time-dependent exposures on the hazard. Stat Med. 2009 Nov 30;28(27):3437-53.
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