My guess is that the problem is your data transfer software and not
Amelia. I haven't known Amelia to produce data sets without anything in
them. Its possible of course, but I haven't seen it. I'm CCing the
listserv in case some of my colleagues or others have a suggestion.
Gary King
On Wed, 8 May 2002, Bob Fitzgerald wrote:
Dear Prof. King and Colleagues:
I ran Amelia (Windows version 2.0, 7/15/2001) on a dataset consisting of
16,722 observations and 34 variables. Amelia was run on the following
platform: 1 gigahertz Pentium III CPU, 512 Megs Ram, Windows XP Professional.
The following issues/questions arose (I have included the log file for your
reference):
1) The program ran through 16 iterations and appeared to conclude
successfully, generating 5 imputed data sets. I had initially tried to pass
Amelia a version 7 Stata data file, but the program failed to load the
Stata data (it opened another DOS window and sat there until I cancelled
the operation). I translated the file from Stata to Gauss format using
DBMSCOPY. The Gauss data file was successfully loaded and Amelia calculated
the correct Ns, means, etc.
2) I selected the Gauss file output option, and each of the 5 resulting
data files was byte equal to the size of the input data file. However, the
resulting data files are not populated, or if there are entries, they are
non-numeric. (I opened each in DBMSCOPY using the "View Data" option.)
3) I ran Amelia with the following parameters: AMempri=3.
AMFully: I entered as many as Amelia would accept (which was far fewer
than the number of fully populated fields in the data file--Can you
specify the hard coded limit or perhaps allow for entering a larger number
in a later version?
I changed the configuration file to set WORKSPACE=256.0, and
CACHE_SIZE=128.
It seems peculiar that Amelia continued to generate the datasets if there
were substantial estimation problems in convergence or other procedures,
and further, that garbage datasets exactly equal in size to the original
Gauss input file could be produced. Any insights or assistance you can
provide would be most helpful. I would be happy to send one of the
resulting files to you for diagnostic purposes. Zipped each file is about 1
meg.
Please let me know if I can provide any further information that would be
helpful in determining if there are problems in the current version of Amelia.
Many thanks.
Bob
Robert Fitzgerald
Senior Research Associate
MPR Associates, Inc.
2150 Shattuck Avenue Suite 800
Berkeley, CA 94704
(510) 849-4942
-
amelia mailing list served by Harvard-MIT Data Center
List Address: amelia(a)latte.harvard.edu
Subscribe/Unsubscribe:
http://lists.hmdc.harvard.edu/?info=amelia