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Re: st: Interaction with Squared Term


From   Ryan Goodstein <ryan.goodstein@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Interaction with Squared Term
Date   Wed, 26 Oct 2011 07:57:19 -0400

Thanks to all of you for your comments.  I'm using Stata on our Unix
server so I am unable to update the version myself.  But apparently
(based on your replies) if I can get our IT department to do so the
problem should be resolved.

Cheers,
Ryan

On Tue, Oct 25, 2011 at 5:33 PM, Nick Cox <n.j.cox@durham.ac.uk> wrote:
> To reinforce Richard's point: Ryan may be looking for an update to -mlogit-. But such a built-in command won't be updated independently of Stata as a whole, which is done through the -update- machinery.
>
> Nick
> n.j.cox@durham.ac.uk
>
> Richard Williams
>
> At 01:48 PM 10/25/2011, Ryan Goodstein wrote:
>>Hello,
>>
>>I am trying to estimate a multinomial logit specification that
>>includes a categorical variable interacted with a squared term.
>>Specifically:
>>
>> > mlogit dq60 invPS##c.o_ltv##c.o_ltv ageq ageq2
>>
>>Stata (v11) gives me the following error:
>>
>> > invalid interaction specification;
>> >
>> > multiple 'o' operators attached to a single variable are not
>> allowed within an
>> > interaction specification{p_end}
>>
>>I saw a post on this on Stata List from 2009 which says this bug will
>>be fixed in an update
>>(http://www.stata.com/statalist/archive/2009-10/msg00584.html), but I
>>haven't been able to find an update.  Has this bug been fixed?
>
> I've just tried commands that appear similar to me with no problems.
> The fact that you say "I haven't been able to find an update" and
> that you say you are using Stata (v11) rather than Stata (v11.2) make
> me wonder if you are clear on how to update. There is nothing you
> need to find. Just give the command
>
> update all
>
> and Stata will take it from there (assuming you have write access to
> your machine). If you do indeed have the latest and greatest version
> of Stata 11.2 and still have problems, let us know.
>
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