|
Glad to know. We can always learn things from the upper floor.
About CLASS statement maybe needs some clarification. Even though I am not very clear why the author used the INTERNAL order rather than default FORMATTED, there is not too much doubt that placing the parameter levels into a certain order won’t hinder how one specifies the method of parameterization for the class variables, say, reference, GLM, etc.
It looks like that in the macro the class variables can be specified in the form of the following:
Creflist = trt(ref ='A')*sex,
In this case, treatment of ‘A’ as the reference level (‘A’ was specified; without specification, instead of ‘B’ as default), but sex of ‘M’ as the reference (M is the larger value, as default).
JingJu
|