[R] Newbie question about by()
david.beede@mail.doc.gov
david.beede at mail.doc.gov
Fri Mar 16 23:10:07 CET 2001
Dear R list:
I want to make separate estimates for each level of the variable "group."
After consulting many sources I am stumped as to why the following does not work:
> wintemp <- subset(alltemp, winner==1)
> my.ppr <- function(x)
+ {
+ if(nrow(x) >= 50) {
+ pprfile <- ppr(award~ilogemp, data=x,nterms=5,max.terms=10,optlevel=3)
+ summary(pprfile)
+ }
+ }
> test.by <- by(wintemp,as.factor(wintemp$group),my.ppr)
Error in model.frame.default(formula = award ~ ilogemp, data = x) :
Object "x" not found
Any help would be greatly appreciated.
(I am sure I am misunderstanding some fundamental R concepts.)
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