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Re: st: Stata 11 Mac crashes


From   Ulrich Atz <u.atz@lse.ac.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Stata 11 Mac crashes
Date   Tue, 7 Dec 2010 09:43:54 +0000

Thanks Jeff and everyone else for your response.

For completeness:
I solved it by generating the interaction term manually.

gen usXhighrelig=us*highrelig
...
margins i.us#i.highed#i.highrelig#i.usXhighrelig, at(age=50)



> Ulrich Atz <u.atz@lse.ac.uk> is using -margins- after -mlogit-, but Stata
> crashes in the middle of the -margins- command execution:
> 
> > I can produce a crash with the following command (all dummy variables) after
> > a multinomial logit regression:
> > 
> > margins i.us#i.highed#i.highrelig#(i.us#i.highrel), at(age=50)
> > 
> > This one for example works -margins
> > (i.us#i.highed#i.highrelig)#i.us#i.highrel, at(age=50)-, though not as I
> > intend. (The idea was to interact the first three dummies with an
> > interaction term.)
> > 
> > I know this is very little information and that the syntax may actually be
> > wrong, but I suppose an error would be more appropriate than a crash. I use
> > Stata/IC 11.1 for Mac (64-bit Intel).
> > 
> > If the statalist is not the right place to report bugs, I apologise.
> 
> We have determined that the crash is caused by more than one duplicate
> variable specified in an interaction; parentheses control the parsing order
> and can prevent the crash.
> 
> This will be fixed in the next executable update.
> 
> 
> In the mean time Ulrich can avoid the crash by specifying a given factor
> variable only once per interaction.
> 
> For example, Ulrich's example was
> 
> 	. margins i.us#i.highed#i.highrelig#(i.us#i.highrel), at(age=50)
> 
> The duplicate variables are 'i.us' and 'i.highrelig', and the parentheses add
> nothing to this interaction specification.  The above syntax is equivalent to
> 
> 	. margins i.us#i.highed#i.highrelig, at(age=50)
> 
> 
> In a side note Ulrich said:
> 
> > (The idea was to interact the first three dummies with an interaction term.)
> 
> If Ulrich meant to separately interact each of the dummies with another term,
> then the following syntax might be what Ulrich wants:
> 
> 	. margins (us highed)#highrelig, at(age=50)
> 
> This is a shorthand notation for
> 
> 	. margins us#highrelig highed#highrelig, at(age=50)
> 
> If Ulrich meant to compute the margins for each dummy in addition to their
> interaction with another term, then Ulrich can type:
> 
> 	. margins (us highed)##highrelig, at(age=50)
> 
> This is a shorthand notation for
> 
> 	. margins i.us i.highed i.highrelig us#highrelig highed#highrelig, at(age=50)
> 
> --Jeff
> jpitblado@stata.com

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