RichardLang wrote:
>
> I've just started using R last week and am still scratching my head.
>
> I have a data set and want to run a separate regression across each level
> of a factor (treating each one separately). The data right now is arranged
> such that the value of the factor along which I want to "split" my data is
> one column among many.
> Best way to do this?
>
> Thanks!
>
You can check out lmList function in the nlme package, or more crudely:
lmfun <- function(d) { lm(y~x,data=d) }
myLmList <- lapply(split(mydata,splitfactor),lmfun)
even more compactly/confusingly:
myLmList <- lapply(split(mydata,splitfactor),lm,formula=y~x)
good luck
Ben Bolker
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