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I've got a complicated semi-parametric model that I'm fitting with mgcv. I start with a model based on theory. Its got lots of interaction terms. I want to winnow it down: removing each interaction term or un-interacted main effect one by one, checking the AIC, and retaining the model that gives me the lowest AIC. I then want to repeat the procedure on the retained model. Here is

...39;s been a  quite  rewarding process so far, and I thank you all R gurus for all your generous help! That being said, my question is about applying a model or an analysis to different groups based on a grouping variable. Below is the first six rows of my data:    ID Group1 Group2 Mem   Gen Chance MSELGM MSELVR MSELFM MSELRL MSELEL ADOS Age 1  1      1           1        75     50.0     50         53               52            62             57            56        3        25 2  2      1           1        75     12.5     50         46               48            47             52            55...