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Topic: degrees of freedom for repeated measures ANOVA
Replies: 3   Last Post: Jun 22, 2012 1:52 AM

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David

Posts: 4
Registered: 6/15/12
degrees of freedom for repeated measures ANOVA
Posted: Jun 15, 2012 8:42 AM
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Hi,

I am trying to work out manually the degrees of freedom for my
experiment. I have a balanced mixed factorial experiment. I have
treatment with two levels (A and B), time with two levels (1 and 2)
and Disease subgroup with three levels (Ctl, G1 and G2). Each patient
has been studied in the two time points but has only been given one
treatment, so if I am not wrong, Patient is nested in Treatment and
Disease Subgroup. I have 8 replications at each level of the factors,
so in total I have 96 observations. I am interested in two
interactions: Treat*Time and Treat*Disease. I want to do this manually
because a specific program I am using within my field complains that I
don't have enough degrees of freedom to do contrasts on my interaction
terms. I hope I am explaining myself since I am biologist with some
experience in statistics

So to build my ANOVA table, I have

Treatment 1df
Time 1df
Disease 2df
Treat*Time 1df
Treat*Diseas 2df



But I am not sure how to follow. How do I account for Patients and how
to calculate my error? I imagine my total is 96 -1


Thanks for your help

Dave



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