Thank you very much Bill!!! We get it. The results are the same. Best wishes,
Alberto 2009/1/30 William Revelle <li...@revelle.net> > 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! >> >> [[alternative HTML version deleted]] >> >> ______________________________________________ >> R-help@r-project.org mailing list >> https://stat.ethz.ch/mailman/listinfo/r-help >> PLEASE do read the posting guide >> http://www.R-project.org/posting-guide.html<http://www.r-project.org/posting-guide.html> >> and provide commented, minimal, self-contained, reproducible code. >> > > > -- > William Revelle http://personality-project.org/revelle.html > Professor > http://personality-project.org/personality.html > Department of Psychology > http://www.wcas.northwestern.edu/psych/ > Northwestern University http://www.northwestern.edu/ > Attend ISSID/ARP:2009 http://issid.org/issid.2009/ > > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html<http://www.r-project.org/posting-guide.html> > and provide commented, minimal, self-contained, reproducible code. > -- Alberto Maceda Veiga Departamento de Biología Animal Vertebrados. 1ª Planta. Despacho 151. Facultad de Biología Universidad de Barcelona Av. Diagonal, 645 08028 Barcelona Spain Tel: 93 4021041 Fax: 93 4034426 Email: albertomac...@gmail.com ><((((º> ><((((º> ><((((º> [[alternative HTML version deleted]]
______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
