[R] spatial logit help

[David Winsemius]

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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>
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David Winsemius, MD
West Hartford, CT