Hi all: In the growth model (Ref.Multilevel Modeling in R (2.3)),I have a question about the variance: On p.73, it says:"To model decreasing variance one can use the varExp option. In cases where variance increases can use the varFixed option (see Pinheiro & Bates, 2000 for details)." My question is: if variance's change is not in a unique trend(for instance: varance increase at first, and then decrease...) How to do with this situation? Thanks a lot! My best [[alternative HTML version deleted]]
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