The short answer is that you can and should
just copy the subroutine to your own program.
Nick
[email protected]
Joseph Coveney
> I noticed that the official Stata command -tetrachoric- has a
> subprogram
> defined in it that I would like to use. The subprogram is
> -PosDef-, which I
> would like to use to perform matrix approximation after
> -polychoric-. How
> can I call -tetrachoric.PosDef- and feed it the polychoric correlation
> matrix?
>
> I've called -tetrachoric- with dummy data just to get the
> ado-file loaded
> into memory, and that worked out okay--I can see it with -program list
> tetrachoric.PosDef-. But after running -polychoric- and
> copying the r(R)
> into a matrix, say, R, I cannot successfuly feed that matrix
> to -tetrachoric-'s -PosDef- subroutine.
>
> That is, something like that below fails, yet I can confirm that the
> subprogram still resides in memory. Do I need to filch the code
> from -tetrachoric- and copy it into a stand-alone ado-file?
>
> Joseph Coveney
>
> [output after initial use of -tetrachoric with dummy data omitted for
> brevity]
>
> . polychoric questionnaire_item*
>
> . matrix R = r(R)
>
> . local N = r(N) // for use in -factormat-
>
> . tetrachoric.PosDef R
> unrecognized command: tetrachoric.PosDef invalid command name
> r(199);
>
> . PosDef R
> unrecognized command: PosDef
> r(199);
>
> . program list tetrachoric.PosDef
>
> tetrachoric.PosDef, rclass:
> 1. args R
> 2. if !issym(`R') {
> 3. error 505
> 4. }
> [output redacted for brevity]
> 22. }
>
> . program list PosDef
> PosDef not found
> r(111);
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