Bookmark and Share

Notice: On March 31, it was announced that Statalist is moving from an email list to a forum. The old list will shut down on April 23, and its replacement, statalist.org is already up and running.


[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: st: reporting results from a multiple imputed data set


From   Joerg Luedicke <joerg.luedicke@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: reporting results from a multiple imputed data set
Date   Wed, 20 Apr 2011 10:47:19 -0400

On Wed, Apr 20, 2011 at 9:52 AM, Lamla, Bettina
<Bettina.Lamla@rwi-essen.de> wrote:
> Hi Joerg!
>
>
> Well, regarding
>
> (1) i can only include  M-1 year dummies.
> If my command includes M year dummies anyway, stata will omit one dummy due to collinearity, i.e. the least significant one.
> (2) the least significant one varies across imputations. Hence I could just exclude let's say year 1 for all estimations and hence cannot report an estimate for this year
>  OR
> I let stata pick the year dummy to be excluded and as a result -after applying the rubin rule- have estimates for all M year dummies even though this would not be possible in the individual regressions
>

So what you mean is that your reference category is a different one in
each of the M regressions? I still do not understand that. If you put
all your dummies in the model, I would think Stata omits the last one
entered, but not the least significant one ("Significant" with regard
to what, anyway? With regard to differences of all permutations; vs.
the rest of the field?) As Maarten said, just pick the reference
category that makes the most sense in your context.

J.

*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/


© Copyright 1996–2014 StataCorp LP   |   Terms of use   |   Privacy   |   Contact us   |   Site index