Hello,
I need to calculate a sandwich covariance matrix in gamm. The package
sandwich does not work because:
Error in UseMethod("vcov") : no applicable method for 'vcov' applied to an
object of class "c('gamm', 'list')"
Does anyone knows how to overcome this problem? Thanks in advance.
Regards,
Isabel Proença
Dep. of Mathematics
ISEG UTL (Technical University)
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