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From |
Stas Kolenikov <skolenik@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: RE thread: SEM with categorical variables |

Date |
Wed, 13 Mar 2013 12:48:39 -0500 |

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: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**Re: st: RE thread: SEM with categorical variables***From:*Laura Maria Schwirz <schwirzl@tcd.ie>

**References**:**st: RE thread: SEM with categorical variables***From:*Laura Maria Schwirz <schwirzl@tcd.ie>

**Re: st: RE thread: SEM with categorical variables***From:*William Buchanan <william@williambuchanan.net>

**Fwd: st: RE thread: SEM with categorical variables***From:*Laura Maria Schwirz <schwirzl@tcd.ie>

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