On Jul 12, 2011, at 7:26 PM, Salifu Wahab wrote:
Please I am new to R. I got the following code from a friend:
gmat <- cbind(gmat,p*(1-p)*wxb)
for (j in seq(1:ncol(gmat))) {
gmat[,j] <- fitted(lm(gmat[,j]~zmat))
}
It is for spatial logit.
After defining all the matrices in it such as P, wxb, gmat, and zmat,
I tried to run it in R and got the following error message:
Error in model.frame.default(formula = gmat[, j] ~ zmat,
drop.unused.levels = TRUE) :
invalid type (list) for variable 'zmat'
R doesn't think zmat is the right class. What does str(zmat) return?
And for that matter why not include str on all of the objects
referenced above?
Any help will be appreciated
Thanks
Abdul
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