Hello
I am having some trouble figuring out how to write contrast/test syntax for the following mixed model regression y ~ group*age + group*age^2 random =~1|ID
(i have centered the age variable & there are only 2 groups)
the contrast i am trying to construct should compare the overall shape of the 2 groups -- in SAS, this does the trick -- test 'group difference in shape' age_squared*group1 -1; age_cent*group 1 -1
Suggestions would be greatly appreciated
Thanks in advance
Dede Greenstein
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