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st: Non-normal alternative to MANOVA?


From   "Airey, David C" <david.airey@Vanderbilt.Edu>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   st: Non-normal alternative to MANOVA?
Date   Fri, 2 Jul 2010 18:55:55 -0500

.

The command -mvtest- allows simple grouped anova with a heterogeneous option. No covariates though.

The -mvtest- command also tests multivariate normality.

> Hi all,
> I have been asked to analyse a small dataset from a randomized controlled trial,
> with 24 subjects (12 in each group, control and intervention). There are 3 sets
> of continuous outcome measures (b1, b2, b3) taken at baseline, 7 weeks and 3
> months, and 2 variables  which need to be controlled for  - level of impairment
> impair (binary) and number of interventions numint (continuous integer).
> 
> If the data were normal I would have done something like this:
> 
> manova b1 b2 b3=group impair numint, continuous(numint)
> 
> and then do various manova tests.
> 
> Unfortunately the outcome data b1-3 are highly skewed, so I can't use manova.
> What would be a good alternative?
> 
> Thanks.



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