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Re: st: Anova repeated measures


From   Michael Norman Mitchell <Michael.Norman.Mitchell@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Anova repeated measures
Date   Fri, 23 Apr 2010 00:47:09 -0700

I think that Morten has a very nice suggestion, using xtmixed due to missing data. To that end, I would highly recommend Phil Ender's presentation to the West Coast Stata User's Group which you can find at

http://www.docstoc.com/docs/28899119/Repeated-Measures-Anova-the-Wide-the-Long-and-the

I think it does an excellent job of progressively walking through the options for analyzing such data, culminating with illustrations of using -xtmixed- for repeated measures analysis and contrasting it with the previously shown alternatives.

Best regards,

Michael N. Mitchell
See the Stata tidbit of the week at...
http://www.MichaelNormanMitchell.com

On 2010-04-22 11.43 PM, Morten Vejs Willert wrote:
Hi Peter

Perhaps you could use repeated measures analysis of variance using
Stata's mixed model capabilities (-xtmixed- command).

Best regards

Morten

2010/4/21 Peter Kraglund Jacobsen<peter@kraglundjacobsen.dk>:
projektnum      t       gruppe  vas
93      1       Parenteral morphine     8
93      2       Parenteral morphine     .
93      3       Parenteral morphine     9
93      4       Parenteral morphine     9
93      5       Parenteral morphine     8
95      1       XXX with NaCl   5
95      2       XXX with NaCl   .
95      3       XXX with NaCl   3
95      4       XXX with NaCl   2
95      5       XXX with NaCl   .
101     1       XXX with Naropine       3
101     2       XXX with Naropine       .
101     3       XXX with Naropine       5
101     4       XXX with Naropine       5
101     5       XXX with Naropine       .

In this example, three persons (projektnum) in three groups (gruppe)
are asked about pain score (vas) at five different times (t).
How do I show if there is a difference in VAS between the three groups?
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