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st: problem with _diparm, conformability error


From   Antoine Terracol <[email protected]>
To   [email protected]
Subject   st: problem with _diparm, conformability error
Date   Fri, 06 Apr 2007 12:37:38 +0200

Dear statalisters,

I have a multiple equation ml model from which I wish to calculate standard errors for various functions of the parameters.

When I try to use _diparm to evaluate the sum of two parameters, one being the constant of an equation (duree1) containing other variables, and the other is a constant from a constant-only equation (mass1), I get the following error message:

. _diparm duree1 mass1, f(@1+@2) d(1 1)
conformability error
r(503);


If, however, I try to sum two constants from constant-only equations, it all works fine:


. _diparm mass1 mass2, f(@1+@2) d(1 1) prob label("sum")
sum | 7.123457 1.241295 5.74 0.000 4.690564 9.55635


applying standard transformation to [duree1][_cons] also works fine:

. _diparm duree1, exp prob
/duree1 | .0022996 .0019432 1.18 0.237 .0004389 .012049


I can't figure out what is wrong with my first example.

Antoine



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