Earlier today I thought I posted this note, but have not seen any response.
At the risk of being a pesk, I've reposted the message.
I am trying to run a one way anova with a single random effect.
The independent variable (Group) has three levels.
Nested within each Group are 4 to 5 sites with about 50 - 60 subjects in
each site. Thus I have about 15 sites and an total N of about 1000
I am considering site as a random variable because we have randomly selected
(and assigned to conditions) these sites from a
larger sampling frame.
I am using the following syntax.
wgt_tot BY group site
/RANDOM = site
/METHOD = SSTYPE(3)
/INTERCEPT = INCLUDE
/EMMEANS = TABLES(group)
/EMMEANS = TABLES(site)
/EMMEANS = TABLES(group*site)
/PRINT = DESCRIPTIVE
/CRITERIA = ALPHA(.05)
/DESIGN = group site group*site .
The output shows zero degrees of freedom for my "group" variable. I wonder
if anyone has suggestions about what I am doing wrong.
(I have run the same syntax without the interaction and have the same problem).
William N Dudley, PhD
Dept Behavi*Science and Health Education
Rollins School of Public Health
Phone 404 727 2447
FAX 404 727 1369