I want insert two variables into a model.matrix, but I don't know how to do that
> k<-model.matrix(m2)
> dim(k)
[1] 475 28
k$township72<-rep(0,475)
Warning message:
In k$township72 <- rep(0, 475) : Coercing LHS to a list
how to insert column to a model.matrix
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