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Re: st: Interaction with Squared Term


From   Richard Williams <richardwilliams.ndu@gmail.com>
To   statalist@hsphsun2.harvard.edu, statalist@hsphsun2.harvard.edu
Subject   Re: st: Interaction with Squared Term
Date   Tue, 25 Oct 2011 17:29:15 -0500

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.


-------------------------------------------
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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