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...55e-23 2. Second, I want to specify different models for two groups (Drivers vs. Nondrivers), but I want only 1 parameter to be different, while everything else remains the same. Should I just create two files with the model equations? But then how do I use these 2 files as an input to the multigroupModel or sem functions? I tried the following but got the error message {Error in model[, 2] : incorrect number of dimensions}. Here is a sample of the code: mod.QT.1 <- specifyEquations(...) # model equations for category 1 mod.QT.2 <- specifyEquations(...) # model equations for category 2 Lst...