Hi all,
I do not have a licence for stata to combine the imputations for amelia. I have thought about using an aggregate function in SPSS to generate means and standard deviations for cases across all the five files (My gut instinct is that this is way too simple). I have also thought about using NORM to combine the five file parameters (Again seems to simple). Any advice on how to combine the amelia data files without stata would be much appreciated.
Kind regards Paul
the theorem only says that if you let it run it will eventually finish,
but there are problems sometimes. almost all the time the problem is due
to difficult or impossible datasets, such as if your panel design is
entirely missing for all the variables for respondents who didn't answer
one of the waves of the survey. I suggest you start with just a couple of
variables that do not have much much missingness, get that to converge,
and then add other variables one or a few at a time and see what happens.
The problem may be entirely in one variable or set of variables, which you
could then remove.
Best of luck,
Gary King
: Gary King, King(a)Harvard.Edu http://GKing.Harvard.Edu :
: Center for Basic Research Direct (617) 495-2027 :
: in the Social Sciences Assistant (617) 495-9271 :
: 34 Kirkland Street, Rm. 2 HU-MIT DC (617) 495-4734 :
: Harvard U, Cambridge, MA 02138 eFax (617) 812-8581 :
On Mon, 10 May 2004, Jose A. Aleman wrote:
> To whom it may concern:
>
> I have been working with Amelia for the past few days. My database consists
> of short panels (the number of countries is large but the number of years
> small) and I can't get Amelia to converge. I am using the minimum number of
> variables I think the algorithm needs to make good guesses but it just runs
> on forever. I have dropped the number of observations but then the program
> does not have enough data to make imputations. Perhaps panel designs are a
> bit more demanding and I should change the settings, but I'm not completely
> sure of what to change, since some of the variables exhibit high
> stationarity and some don't. What is the most time I can expect Amelia to
> run for in these situations?
>
> Thanks,
>
> Jose Aleman
> PhD Candidate
> Politics Department
> 130 Corwin Hall
> Princeton, NJ 08544
> 609.937.0190
> 609.258.2147
> <http://www.princeton.edu/~jaaleman>
>
>
