Hello fellow Rers,
I have a no-doubt simple question which is turning into a headache so
would be grateful for any help.
I want to do a principal components analysis directly on a correlation
matrix object rather than inputting the raw data (and specifying cor =
TRUE or the like). The reason behind this is I need to use polychoric
correlation coefficients calculated with John Fox's hetcor function. Is
there a way to do this with princomp or prcomp, or any other principal
components function in other R packages?
Again, very grateful for any help.
David Evans.
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