| Date: | Mon, 13 Jan 1997 16:34:54 +0000 |
|---|
| Reply-To: | n.w.nelson@education.leeds.ac.uk |
|---|
| Sender: | "SPSSX(r) Discussion" <SPSSX-L@UGA.CC.UGA.EDU> |
|---|
| From: | nick nelson <n.w.nelson@EDUCATION.LEEDS.AC.UK> |
|---|
| Organization: | Leeds University |
|---|
| Subject: | Re: Correlations |
|---|
| Content-Type: | text/plain; charset=us-ascii |
|---|
Nichols, David wrote:
> 4) Tetrachoric correlations are special cases of polychoric
> correlations. No
> SPSS procedure directly calculates them, though PRELIS does (as a
> special
> case of polychoric correlations).
I am also interested in computing tetrachoric correlations as a
precursor
to factor analysing the matrix to determine the dimensionality of test
responses.
Where can I find documentation for PRELIS? the help system will show
me the syntax, but I feel I need more than that.
Regards, Nick.
|
