[R] sandwich matrix in gamm
isabelp at iseg.utl.pt
Wed Jun 5 13:01:55 CEST 2013
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.
Dep. of Mathematics
ISEG UTL (Technical University)
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