[R] R2

[Max Kuhn]

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 <nancyadam84 at 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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