Proc Mixed sphericity test ?

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Proc Mixed sphericity test ?

I read your article. http://www.ats.ucla.edu/stat/sas/library/mixedglm.pdf
(R.D. Wolfinger and M. Chang. Comparing the SAS GLM and MIXED procedures
for repeated measures. Technical report, SAS Institute Inc., Cary, NC,
) and saw on expression on page 10th . in 6th row (PROC MIXED) in
table 1 (Can produce sphericity test results either by running both
TYPE=UN and TYPE=HF or by using TYPE=UN on transformed data). I applied
the expression but I got on error message so I couldn’t get any result
please, could you help me how to solve this problem.
What I can add to the under code, that I see the results of the
sphericcity test results.
I have a code block as shown following, what code do I need to solve my
problem thank you.

Thank you for your help.

proc mixed data=formixed;
class gender person;
model y = gender|age|age|age ;
repeated / type=un sub=person;
run;
Frequent Contributor
Posts: 77

Re: Proc Mixed sphericity test ?

Excellent discussion of the sphericity tests on SAS-L@LISTSERV.UGA.EDU :

http://listserv.uga.edu/cgi-bin/wa?A2=ind0505b&L=sas-l&O=D&P=10488
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