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From: Ching on 19 Apr 2010 02:30
Hi everyone.

I fitted a 3-level model something like below:

proc mixed data=out covtest cl ic method=reml;
class plant worker;
model log_exp= A B C B*C / ddfm=satterth solution;
random int / subject=plant solution;
random int / subject=plant*worker solution;
run;

And may I please ask how should I check the residual? And how would I
know the assumption is met from the residual plot? From my
understanding, the residuals have to be scattered around.

Any advice is greatly appreciated. Have a good week.
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