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Fwd: st: RE thread: SEM with categorical variables
From
Laura Maria Schwirz <[email protected]>
To
[email protected]
Subject
Fwd: st: RE thread: SEM with categorical variables
Date
Wed, 13 Mar 2013 15:06:08 +0000
Thanks for quick reply. It actually works up to a certain point..
local thevars hewsonstrong hewsonknowo hewsonint hewsoninspi
hewsonmoral hewsoncom hewsondecent hewsondepend hewsonrel hewsonsens
. polychoric `thevars'
Polychoric correlation matrix
(output omitted)
. mat polychR = r(R)
. forvalues i=1/`: word count `thevars' ' {
2. forvalues j=1/`i' {
3. local setcor `setcor' `=polychR[`i',`j']'
4. }
5. if `i' < `: word count `thevars' ' local setcor `setcor' \
6. }
. local N = _N
.
end of do-file
. do "/var/folders/lw/lweDBBEGH68nFpOhV2D+gk+++TI/-Tmp-//SD00459.000000"
. clear
. ssd init hewsonstrong hewsonknowo hewsonint hewsoninspi hewsonmoral
hewsoncom hewsondecent hewsonde
> pend hewsonrel hewsonsens
Summary statistics data initialized. Next use, in any order,
ssd set observations (required)
It is best to do this first.
ssd set means (optional)
Default setting is 0.
ssd set variances or ssd set sd (optional)
Use this only if you have set or will set correlations and,
even then, this is optional but
highly recommended. Default setting is 1.
ssd set covariances or ssd set correlations (required)
. ssd set obs `N'
number required
r(100);
Once I run the 'clear' command, it stops working.
Many thanks for your help, much appreciated.
Laura
On 13 March 2013 14:42, William Buchanan <[email protected]> wrote:
>
> I don't think it's a problem with Stas's code:
>
> clear
> set obs 1000
> set seed 123412345
> loc thevars hewsonstrong hewsonknowo hewsonint hewsoninspi hewsonmoral hewsoncom hewsondecent hewsondepend hewsonrel hewsonsens
> foreach v of loc thevars {
> qui: g id=runiform()
> qui: sort id
> /* Create categorical variables */
> qui: egen `v' = cut(id), group(5)
> /* Recode the variables to have a scale of 1-5 */
> qui: replace `v'=`v'+1
> qui: drop id
> ta `v'
> }
> di `"`thevars'"'
> polychoric `thevars'
>
> You should get the matrix below:
>
> hewsonstrong hewsonknowo hewsonint hewsoninspi hewsonmoral hewsoncom hewsondecent hewsondepend hewsonrel hewsonsens
> hewsonstrong 1
> hewsonknowo .00757784 1
> hewsonint -.01262061 -.02690757 1
> hewsoninspi -.02231892 .00686848 -.05248286 1
> hewsonmoral -.01757277 .03654591 -.01172315 .00876538 1
> hewsoncom .02118915 -.01551056 -.01772426 -.00254414 -.01837419 1
> hewsondecent -.04116923 .01386142 .01676589 .02919821 .02132269 -.03298761 1
> hewsondepend -.05280085 -.04659978 .04573638 .01585641 .06480197 -.01835768 -.02216604 1
> hewsonrel .02682836 -.00184872 -.00382025 .01606113 -.03550408 -.0348673 .06411171 -.02613873 1
> hewsonsens .02954704 -.0527784 .01723573 -.06313792 .00313384 .01654635 .02302709 -.00659043 -.0318338 1
>
>
>
>
> On Mar 13, 2013, at 7:21 AM, Laura Maria Schwirz <[email protected]> wrote:
>
> > I am referring to a previous thread (RE: sem with categorical
> > variables, September 2012) as I have similar problems. I tried using
> > Stas' code for polychoric to sem analysis but the local command
> > appears to be a problem. If I type
> >
> >> local thevars hewsonstrong hewsonknowo hewsonint hewsoninspi hewsonmoral hewsoncom hewsondecent hewsondepend hewsonrel hewsonsens
> >> display `thevars'
> >> polychoric `thevars'
> > varlist required
> >
> > It as actually empty so i can't proceed with the polychor command
> > Any thoughts/ideas of where I am going wrong?
> >
> > Thanks,
> > Laura
> > *
> > * For searches and help try:
> > * http://www.stata.com/help.cgi?search
> > * http://www.stata.com/support/faqs/resources/statalist-faq/
> > * http://www.ats.ucla.edu/stat/stata/
>
>
> *
> * For searches and help try:
> * http://www.stata.com/help.cgi?search
> * http://www.stata.com/support/faqs/resources/statalist-faq/
> * http://www.ats.ucla.edu/stat/stata/
>
--
Laura Schwirz
PhD Candidate and IRCHSS Scholar
Department of Political Science
Trinity College Dublin
Dublin 2
Republic of Ireland
Email: [email protected]
--
Laura Schwirz
PhD Candidate and IRCHSS Scholar
Department of Political Science
Trinity College Dublin
Dublin 2
Republic of Ireland
Email: [email protected]
*
* For searches and help try:
* http://www.stata.com/help.cgi?search
* http://www.stata.com/support/faqs/resources/statalist-faq/
* http://www.ats.ucla.edu/stat/stata/