Re: Export pooled Multiple Imputation data

Posted by torvon on Apr 28, 2012; 5:42am
URL: http://spssx-discussion.165.s1.nabble.com/Export-pooled-Multiple-Imputation-data-tp5669830p5673493.html

Thank you, I was indeed not aware of the technical details. I'll follow standard practise and export multiple data sets to analyze them in R.

On Apr 27, 2012 5:40 PM, "Jon K Peck" <[hidden email]> wrote:

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: <a href="tel:[phone]" value="[phone]" target="_blank">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]>

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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). 

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. 

If that were the case, I could savely export the mean of the 5 imputations and work on this file with other programs. Correct? 

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). 

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.  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).  

This same question has appeared before on this list quite recently.  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
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