At 3:00 PM +0100 1/30/09, Alberto Maceda Veiga wrote:
Hi!
I am trying to analyse with R a database that I have previously analysed
with SPSS.
Steps with SPSS:
Factorial analysis
Extraction options : I select = Principal component analysis
Rotation: varimax
Unfortunately, SPSS labels principal components as a factor model.
It is not. So, extracting the first n factors by using factanal
will give you a very different solution than the first n principal
components.
Steps with R:
I have tried it with varimax function with factanal or with princomp...and
the results are different of what I have with SPSS. I think that varimax
function is incorporated in factanal function.
Does anybody know which are the instructions into R to do exactly the same
of what I have done with SPSS???
To duplicate the SPSS analysis try using the psych package.
The principal function in the psych package will extract the first n
components (defaults to 1) and then by default rotate using varimax.
library(psych)
pc <- principal(my.data,n) #where n is the number components you
want to extract
Let me know if this matches the SPSS output.
Bill
Thank you very much!
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