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