hi, I have two questions:
#first (SPSS vs. R):
I just compared the output of different PCA routines in R (pca, prcomp,
princomp) with results from SPSS. the loadings of the variables differ
vastly! in SPSS the variables load constantly higher than in R.
I made sure that both progr. use the correlation matrix as basis. I
found the same problem with rotated values (varimax rotation and rtex=T
rotation).
can anyone comment ?
second:
princomp(data, cor=T, rtex=T)$loadings vs. princomp(data, cor=T,
rtex=F)$loadings
gives me different loadings (expected because of rotation) with one
dataset (11 variables)
but returns the SAME values with another dataset (3 variables).
comments ??
thanks for your time!
cheers,
gregor
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