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help for refgroup
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Set reference group for coded categorical variables

        refgroup varname value

Description

refgroup is convenience command that sets the value of the reference group for
coded categorical variables using xi and xi3.

It is equivalent to 
 . char varname[omit] value

Example

 . refgroup prog 3

Author

     Philip B. Ender
     UCLA Depatment of Education
     UCLA Academic Technology Services
     enderatucla.edu