Nancy,
There is a function in the caret package called defaultSummary that
will compute both RMSE and R2 for you.
Max
On Dec 28, 2009, at 11:51 PM, Nancy Adam <nancyada...@hotmail.com>
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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