After an off-list email exchange, it sounds like the pls package and Partial
Least Squares are appropriate for this analysis.

Kevin Wright


2009/11/4 Joel Fürstenberg-Hägg <joel_furstenberg_hagg@hotmail.com>

>
> Hi all,
>
>
>
> I'm new to PCA in R, so this might be a basical thing, but I cannot find
> anything on the net about it.
>
> I need to make a PCA plot with two response variables (df$resp1 and
> df$resp2) against eight metabolites (df$met1, df$met2, ...) and I don't have
> a clue how to do... and I've only used the simplest PCAs before, like this:
>
>
>
> pcaObj=prcomp(t(df[idx, c(40:47)]))
>
> biplot(pcaObj)
>
>
>
> Anyone who knows how to do?
>
>
>
> Best rageds,
>
>
>
> Joel
>
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