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Re: st: RE thread: SEM with categorical variables


From   Laura Maria Schwirz <schwirzl@tcd.ie>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   Re: st: RE thread: SEM with categorical variables
Date   Thu, 14 Mar 2013 09:21:13 +0000

Thanks, that makes sense as I had been running it line by line to
understand each step.
Just tried running the code all at the same time and this is working
just fine now.

Thanks,
Laura

On 13 March 2013 17:48, Stas Kolenikov <skolenik@gmail.com> wrote:
> The code does not run not because of the -clear- command, but because your
> local `N' is defined only in the first do-file, and cannot be accessed by
> the second one. With locals, don't try cheat and run pieces of code, put
> everything into a single file and run it top to bottom. (Your previous
> problem was likely of similar nature that you ran your lines from the
> do-editor by selecting a few lines and sending them to Stata; that way,
> later lines have no idea about locals defined in earlier files, as these
> locals died when the do-files exited.)
>
> -- Stas Kolenikov, PhD, PStat (SSC)
> -- Senior Survey Statistician, Abt SRBI
> -- Opinions stated in this email are mine only, and do not reflect the
> position of my employer
> -- http://stas.kolenikov.name
>
>
>
> On Wed, Mar 13, 2013 at 10:06 AM, Laura Maria Schwirz <schwirzl@tcd.ie>
> wrote:
>>
>> 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 <william@williambuchanan.net>
>> 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 <schwirzl@tcd.ie>
>> > 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: schwirzl@tcd.ie
>>
>>
>>
>> --
>> Laura Schwirz
>>
>> PhD Candidate and IRCHSS Scholar
>> Department of Political Science
>> Trinity College Dublin
>> Dublin 2
>> Republic of Ireland
>> Email: schwirzl@tcd.ie
>> *
>> *   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:
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>



--
Laura Schwirz

PhD Candidate and IRCHSS Scholar
Department of Political Science
Trinity College Dublin
Dublin 2
Republic of Ireland
Email: schwirzl@tcd.ie
*
*   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/


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