Re: Export pooled Multiple Imputation data
Posted by
Jon K Peck on
Apr 27, 2012; 3:40pm
URL: http://spssx-discussion.165.s1.nabble.com/Export-pooled-Multiple-Imputation-data-tp5669830p5670682.html
No. That would mean that the whole
point of multiple imputation is lost. See the algorithms documents
for details.
Jon Peck (no "h") aka Kim
Senior Software Engineer, IBM
[hidden email]
new phone: 720-342-5621
From:
torvon <[hidden email]>
To:
[hidden email]
Date:
04/27/2012 09:04 AM
Subject:
Re: [SPSSX-L]
Export pooled Multiple Imputation data
Sent by:
"SPSSX(r)
Discussion" <[hidden email]>
Bruce, thank you. I did search both on google and the
list (http://spssx-discussion.1045642.n5.nabble.com/template/NamlServlet.jtp?macro=search_page&node=1068821&query=multiple+imputation),
but didn't this problem (sorry in case I overlooked a thread).Â
If I understand correctly, a GLMM in SPSS on an Multiple
Imputation dataset with 5 imputations will run 5 GLMM and then somehow
average the results. I would make the bold statement that, would one average
the data of the 5 imputations into one mean observation, and then run one
GLMM, one would get the same GLMM results.Â
If that were the case, I could savely export the mean
of the 5 imputations and work on this file with other programs. Correct?Â
How would I do that? I don't know how to access the imputated
dataset in order to compute a new variable in SPSS syntax (I want to compute
x_new by building the mean of the 5 imputed datasets of x).Â
Thank you!
On 27 April 2012 13:59, Bruce Weaver [via SPSSX Discussion]
<[hidden
email]> wrote:
If you mean pooled imputed values for raw data points,
there is no such thing. Â When you use multiple imputation, the model
is run on each of the imputed data sets, and then pooled estimates of model
parameters and their standard errors are computed (via formulae described
by Rubin & others). Â
This same question has appeared before on this list quite recently. Â Search
the archives for other responses.
torvon wrote
I am using Multiple Imputation in SPSS 20 to impute missing
values. However, since I am running multivariate multilevel analysis with
the MCMCglmm package in R, I need to export the data.
I have found no option to export the pooled imputed values. What would
you recommend?
Thank you
T
--
Bruce Weaver
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