Dear Kathleen, You can use the sem() function in the sem package to fit CFA models from tetrachoric correlations computed with the polycor package. See ?boot.sem in the sem package for an example using polychoric correlations for ordinal observed variables (tetrachoric correlations are a special case when the variables are dichotomous). This example is also described in a paper that you can get at <http://socserv.mcmaster.ca/jfox/Misc/sem/SEM-paper.pdf>.
I hope this helps, John -------------------------------- John Fox, Professor Department of Sociology McMaster University Hamilton, Ontario, Canada L8S 4M4 905-525-9140x23604 http://socserv.mcmaster.ca/jfox > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] > project.org] On Behalf Of Kathleen Kemp > Sent: January-12-08 9:11 AM > To: r-help@r-project.org > Subject: [R] Factor Analysis > > Good Morning, > > Is it possible to use the R program for a CFA with dichotomous data? > > Thank you, > > Kathleen > > > Kathleen Kemp, M.A. > Doctoral Clinical Psychology Student, > Concentration: Forensic Psychology > Drexel University > Philadelphia, PA 19104 > [EMAIL PROTECTED] > > > > [[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. ______________________________________________ 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.
