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st: Repeated Measures ANOVA vs. Friedman test


From   Steve <cheesehead.in.tx@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: Repeated Measures ANOVA vs. Friedman test
Date   Mon, 21 May 2012 16:03:37 -0500

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?

Thanks in advance for any help with this.

- Steve
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