Can you tell me how to impose equality constraints on the mean growth parameters in a 2 part growth model? I'm using the KNOWNCLASS command to specify my 3 groups. An unconstrained model shows that the slopes for both the binary and continuous parts of the outcome variable vary across groups, but I would like to be able to test whether these differences are significant. Thanks.
Thanks for your response. I wasn't clear - what I want to do is test equality of the slopes for the continuous part across groups, and then for the binary part across groups. I don't want compare the 2 slopes to each other. I have checked the manual, but can't seem to figure out how to impose the cross group equality constraints in this setting. Can you recommend an example I can look at for imposing across group equality constraints on su and sy as defined in the code below? Thanks.