Gabor Grothendieck wrote:
** works as exponentiation for me:
3**2
[1] 9
Yes, but see ?"**" that it is just documented in a note and has been
deprecated in S since 20 years...
Uwe Ligges
On Tue, Dec 29, 2009 at 6:10 AM, Phil Spector <spec...@stat.berkeley.edu> wrote:
Nancy -
Please notice that ** is not an R operator. The caret (^) is the
exponentiation operator in R.
- Phil
On Tue, 29 Dec 2009, Nancy Adam wrote:
Hi everyone,
I tried to write the code of computing R2 for a regression system but I
failed.
This is the code I use for computing RMSE:
my_svm_model <- function(myformula, mydata, mytestdata)
{
mymodel <- svm(myformula, data=mydata)
mytest <- predict(mymodel, mytestdata)
error <- mytest - mytestdata[,1]
-sqrt(mean(error**2))
}
can anyone please tell me what I have to change to compute R2 instead of
RMSE?
Many thanks,
Nancy
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