[R] Noobie question, regression across levels

[Ben Bolker]

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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