--- prneiva <[email protected]> wrote:
> When I write matrix list r(Rho), the answer is matrix r(Rho) not
> found.
Did you type -matrix list r(Rho)- after typing -tetrachoric varlist,
whatever option-? Better yet, did you copy the example I gave you and
tried that. That example should not give that error message, at least
it didn't gave me that error message.
> When I use the following procedure:
> matrix C = r(Rho)
> local n = r(N)
> factormat C, n(`n')
>
> the answer is: matrix C has missing values.
>
> I don�t know what is happening, since the codebook shows that there
> is no missing values.
Missing values in your data isn't the issue here, the missing values
are in the matrix. -factormat- needs all pairwise correlations, and if
one is missing it complaints. You can still get a complete correlation
matrix if you have missing data. One way to see what's going on is to
type -matrix list C-.
Actually, if you are using real data I'd be worried if I did not have
missing values. It's not that I like them, but I know that real data
has them and that if I can't find them someone else has done something
I might not like, like just delete any case with a missing value or
impute it with the mean.
HTH,
Maarten
-----------------------------------------
Maarten L. Buis
Department of Social Research Methodology
Vrije Universiteit Amsterdam
Boelelaan 1081
1081 HV Amsterdam
The Netherlands
visiting adress:
Buitenveldertselaan 3 (Metropolitan), room Z434
+31 20 5986715
http://home.fsw.vu.nl/m.buis/
-----------------------------------------
Send instant messages to your online friends http://uk.messenger.yahoo.com
*
* For searches and help try:
* http://www.stata.com/support/faqs/res/findit.html
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/
