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strata
2001 Aug 12
1
Creating a Model Matrix - keeping NAs
I am wanting to create a model matrix and keep the NAs.
stratmat <- model.matrix(myformula,mydata)
Is there any way to do this? model.matrix doesn't have na.action as a
parameter. Elsewhere I have made use of na.keep <- function(x){x}.
Many thanks,
Rachel Cunliffe
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r-h...