Prof Brian Ripley wrote:
> On Sun, 20 Apr 2008, Gad Abraham wrote:
>
>> Hi,
>>
>> Say x.train is a matrix of covariates that I want to do PCA on, so I can
>> do regression on its principal components, and x.test is a test set of
>> the same covariates on which I want to evaluate the regression fit
On Sun, 20 Apr 2008, Gad Abraham wrote:
> Hi,
>
> Say x.train is a matrix of covariates that I want to do PCA on, so I can
> do regression on its principal components, and x.test is a test set of
> the same covariates on which I want to evaluate the regression fit. I
> would like the covariates to
Hi,
Say x.train is a matrix of covariates that I want to do PCA on, so I can
do regression on its principal components, and x.test is a test set of
the same covariates on which I want to evaluate the regression fit. I
would like the covariates to be centred and scaled:
p <- prcomp(x.train, cen
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