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Obsidian | Level 7 Clg
Obsidian | Level 7

Hello everybody,


I have a question about the interpretation of an one-way ANOVA. The variable TRT have 3 groups and I use a proc mixed to obtain estimate and lsmeans.


My code is :


proc mixed data=base method=reml ;
class TRT;
model param= TRT / s alpha=0.10  ;
estimate "b versus A " TRTA -1 1 0 / cl alpha=0.10 ;
lsmeans TRT/ cl alpha=0.1;


With the estimate, when I compare Bvs A, I obtain a pvalue=0.0478. But when I look the estimate means with the lsmeans statement I obtain estimate means and IC :

- group A : 1.0163402115 [0.9107315766 ; 1.1341952469]
- group B : 0.844887592 [0.7603604662; 0.9388113597]


We can see that the IC overlap so, I think that there is no difference between group, however, the pvalue=0.0478. How could you explain this situation according you ? Maybe because each group has a small size ? (n=12).

Thank you in advance for your answer.


Diamond | Level 26

Overlapping confidence intervals is never a valid way to perform an hypothesis test. So I would believe that pvalue=0.0478 is correct.

Paige Miller


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