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Re: st: Repeated Measures ANOVA vs. Friedman test


From   David Hoaglin <dchoaglin@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Repeated Measures ANOVA vs. Friedman test
Date   Mon, 21 May 2012 21:57:30 -0400

Since the data are longitudinal, it would be appropriate to analyze
them in that way --- for example, by using -xtmixed-.

David Hoaglin

On Mon, May 21, 2012 at 5:03 PM, Steve <cheesehead.in.tx@gmail.com> wrote:
> Hi All,
>
> I was going to compare some data from a pilot study where there were
> repeated measures taken from subjects (1 measurement each at baseline,
> 2 weeks and 4 weeks).  I've got a small sample size (n=6 per group)
> and the outcome of interest is a continuous variable.  My question is
> whether I can use a repeated measures ANOVA to evaluate such a small
> sample size or whether I should go with Friedman?  Or should I use
> something else - a mixed model perhaps?
>
> I did draw histograms and box plots to see what the distributions and
> it looks more or less normally distributed but it's hard to really say
> with such a small sample size.  Additionally, the sktest had a value
>>0.05.  So is it okay to use RM ANOVA for n of 6 per group?

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