What is the difference between oblimin rotation in R and direct oblimin rotation in SPSS?

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Abdullah Faruk Kılıç

Hi Lu;

Psych package in R, use GPArotation package to rotate factors. In the GPAroatation package oblimin rotation was given as,

oblimin(L, Tmat=diag(ncol(L)), gam=0, normalize=FALSE, eps=1e-5, maxit=1000) .

So it can be seen R code use gamma=0,

But in the SPSS, direct oblimin rotation use Delta=0 for default. Your results could be differ beacuse of this difference, i think.

Best regards.

Lu Yang

Abdullah Faruk Kılıç Thank you Abdullah! It is the normalization. In SPSS, normalize=TRUE. but in GPArotation package, normalize=False.