Re: [R] Testing significance of interaction between group and longitudinal change for part of the age range in a mixed linear model

2012-07-26 Thread Bert Gunter
1. Your post is unacceptable (imho, of course). Read the bottom of this message (re: "posting guide") and re-post properly. 2. This is not an R-help question. Re-post on r-sig-mixed-models -- or perhaps on a non-R statistical forum like stats.stackexchange.com, as this appears to have little to do

[R] Testing significance of interaction between group and longitudinal change for part of the age range in a mixed linear model

2012-07-26 Thread Angela Brant
Hi all, I've fit a mixed linear model to some longitudinal data. I'm interested in the differences in patterns of decrease in the dependent variable according to group status, and my hypothesis particularly predicts a difference between the groups in trajectory of change at between specific a