RMANOVA + Pooling data after MI

[Sumnall, Harry]

Dear Colleagues, I have imputed missing values using the SPSS (v17)
multiple imputation technique. In accordance with the missing values
manual my data is split by Imputation_ and in SPSS Edit>Options i have
requested that Pooled results are shown in the output.

However after running my required repeated measures ANOVA my output
shows the results of each imputation, but not the pooled results.
Manipulating the pivot table in accordance with the manual does not
allow me to view the pooled results, only all imputations
independently or all together.

I wonder if anyone has faced this problem before? Searching on Google I
noticed someone else had this problem but a solution wasn't posted.  Using
the tutorial
data and running a MLR i was able to show pooled data as expected, but
not it seems with RMANOVA.

All help appreciated,

Thanks

Harry

Dr Harry Sumnall
Reader in Substance Use
Centre for Public Health
Liverpool John Moores University
Kingsway House
Hatton Garden
Liverpool
L3 2AJ

Tel: [phone]
Fax: [phone]
http://www.cph.org.uk/harrysumnall

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[Joost van Ginkel]

Dear Harry,

To date, no combination rules for MI in (repeated measures) ANOVA or
MANOVA have been defined. For ANOVA you may resolve the problem by using
a multilevel model in Mixed models, where repeated measures are nested
within subjects. SPSS can give pooled results within Mixed models. For
MANOVA there is not really a solution at hand yet.

Best regards,

Joost van Ginkel


Joost R. Van Ginkel, PhD
Leiden University
Faculty of Social and Behavioural Sciences
Data Theory Group
PO Box 9555
2300 RB Leiden
The Netherlands
Tel: [phone]
Fax: [phone]


-----Original Message-----
From: SPSSX(r) Discussion [mailto:[hidden email]] On Behalf Of
Harry Sumnall
Sent: 18 August 2009 12:58
To: [hidden email]
Subject: RMANOVA + Pooling data after MI

Dear Colleagues, I have imputed missing values using the SPSS (v17)
multiple imputation technique. In accordance with the missing values
manual my data is split by Imputation_ and in SPSS Edit>Options i have
requested that Pooled results are shown in the output.

However after running my required repeated measures ANOVA my output
shows the results of each imputation, but not the pooled results.
Manipulating the pivot table in accordance with the manual does not
allow me to view the pooled results, only all imputations independently
or all together.

I wonder if anyone has faced this problem before? Searching on Google I
noticed someone else had this problem but a solution wasn't posted.
Using the tutorial data and running a MLR i was able to show pooled data
as expected, but not it seems with RMANOVA.

All help appreciated,

Thanks

Harry

Dr Harry Sumnall
Reader in Substance Use
Centre for Public Health
Liverpool John Moores University
Kingsway House
Hatton Garden
Liverpool
L3 2AJ

Tel: [phone]
Fax: [phone]
http://www.cph.org.uk/harrysumnall

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[hidden email] (not to SPSSX-L), with no body text except the
command. To leave the list, send the command SIGNOFF SPSSX-L For a list
of commands to manage subscriptions, send the command INFO REFCARD

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=====================
To manage your subscription to SPSSX-L, send a message to
[hidden email] (not to SPSSX-L), with no body text except the
command. To leave the list, send the command
SIGNOFF SPSSX-L
For a list of commands to manage subscriptions, send the command
INFO REFCARD