Thank you. Your point about "order matters" made me remember the -orderasis- option. The fix I suggested earlier (setting the seed manually prior to both -ice- and -mim-) doesn't seem to work if you are using weights...but using both the -orderasis- and the -seed- options of -ice- seems to fix the problem.
-----Original Message-----
From: Rodrigo Alfaro A. [mailto:[email protected]]
Sent: Friday, August 22, 2008 10:16 AM
To: [email protected]
Cc: Medina, Tait Runnfeldt
Subject: RE: st: ice and random-number seed
///
Tait,
I think that your case is more complicated than Maarten's example.
(1) You are using weights. If I recall correctly ICE produces results
using iterations => order matters. My suggestion is to try your problem
without weights.
(2) Sorting could make some differences here. You could try imputing
one dataset each time using a specific seed. It is expected the
correlations between imputed variables (original y replication) should
be one.
Under (1) you have no solution. Under (2) you could control the problem
imputing 1 dataset at the time with specific seeds. We had problem (2)
with user-written routine hotdeck.
Rodrigo.
-----Mensaje original-----
De: [email protected]
[mailto:[email protected]] En nombre de Medina, Tait
Runnfeldt
Enviado el: Viernes, 22 de Agosto de 2008 08:15 a.m.
Para: [email protected]
Asunto: RE: st: ice and random-number seed
Dear Richard:
Thank you for your reply.
I tried using -mim- and version 1.4.6 PR 25apr2008 of -ice-, but I am
still unable to reproduce results.
On a side note, I was under the impression that the command -adoupdate-
would update user-written packages, but the command failed to update my
installed -ice- package. Am I mistaken in my understanding of this
coomand?
Tait
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Richard
Williams
Sent: Friday, August 22, 2008 12:36 AM
To: [email protected]; [email protected]
Subject: Re: st: ice and random-number seed
At 09:43 PM 8/21/2008, Medina, Tait Runnfeldt wrote:
>I am unable to reproduce regression results using imputed data
>generated via Royston's -ice- command, although I am using the
>-seed- option. A comparison of a mock original and an attempted
>replication, illustrating this problem, can be found in step #4 below.
>
>I am using Stata version 10.1. The version of -ice- and -micombine-
>being used can be found in step #5 below.
You might also try -mim- instead of -micombine-. I'm not sure why both
exist since Royston is an author of both, but my impression is that
-mim- is better. You may need to rename some of the vars created by
-ice-. -mim- is available on SSC.
-------------------------------------------
Richard Williams, Notre Dame Dept of Sociology
OFFICE: (574)631-6668, (574)631-6463
HOME: (574)289-5227
EMAIL: [email protected]
WWW: http://www.nd.edu/~rwilliam
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