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Re: st: -warning: variables in at() list not found in model after mfx or mfx2


From   Mirko <mirko.moro@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: -warning: variables in at() list not found in model after mfx or mfx2
Date   Sat, 21 Jul 2007 10:42:47 +0200

Thanks for that. I checked with various example and it seems to work indeed.

On 7/21/07, Richard Williams <Richard.A.Williams.5@nd.edu> wrote:
At 05:56 PM 7/20/2007, Jean Marie Linhart, StataCorp. wrote:
>Mirko <mirko.moro at gmail dot com> and others have reported a mysterious
>warning message with -mfx2- after -regoprob-, identifying that it is
>generated by -mfx- when the variable list in the original estimation and
>-at()- specification are long.  We have been able to reproduce this
>problem.
>
>We believe the results from -mfx- are correct; the warning message is not
>correct and can be ignored.  We want to do a little more exploring,
>and we will
>report back to the list with a definitive answer.

Thanks Jean.  -mfx- subprograms -at- and -Parseatlist- include a lot
of equals signs when working with strings, and also use the string
functions -trim- and -index-.  I think some or all of these can have
problems once strings get to be more than 244 characters.  In
particular, mfx subprogram Parseatlist includes the lines

                 if index("`vars'","`thing1'")==0 {
                         local unfnd ="`unfnd'"+ " `thing1'"
                 }

That eventually leads to a false warning message if thing1 does not
occur within the first 244 characters of vars.  I changed those lines to

                 local unfnd: list thing1 - vars

and the error went away.  Anyway, I think that is among the changes
that could/should be made in mfx.

As far as I can tell though, you are correct in saying that, despite
the incorrect warning, mfx does produce the correct results.




-------------------------------------------
Richard Williams, Notre Dame Dept of Sociology
OFFICE: (574)631-6668, (574)631-6463
HOME:   (574)289-5227
EMAIL:  Richard.A.Williams.5@ND.Edu
WWW:    http://www.nd.edu/~rwilliam

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