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st: Repeated Measures ANOVA vs. Friedman test
From
Steve <[email protected]>
To
[email protected]
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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