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check_model checks that the argument model is correctly specified.
check_model
check_model(model)
is "GMAR", "StMAR" or "G-StMAR" model considered? In G-StMAR model the first M1 components are GMAR-type and the rest M2 components are StMAR-type.
M1
M2
Doesn't return anything, but throws and error if something is wrong.