Hello,
I want to know if there is a way that I can elimnate refrence option in class statement using genmod procedure?
Because when I run my model, it gives me the last category of each variable in the class as a reference to that variable.
A classification variable compares the effect of each level to SOMETHING. Often the comparison is to a reference level, but it could also be to last level, the first level, or the average effect over all levels.
The documentation for "Parameterization of Model Effects" discusses the various ways to choose a parameterization for a CLASS variable. For interpretation and applications of different parameterizations, see Pasta (2005).
For PROC GENMOD, you can use the PARAM= option to choose the parameterization. For example:
CLASS C / param=effect ref='MyRefLevel';
Don't miss out on SAS Innovate - Register now for the FREE Livestream!
Can't make it to Vegas? No problem! Watch our general sessions LIVE or on-demand starting April 17th. Hear from SAS execs, best-selling author Adam Grant, Hot Ones host Sean Evans, top tech journalist Kara Swisher, AI expert Cassie Kozyrkov, and the mind-blowing dance crew iLuminate! Plus, get access to over 20 breakout sessions.
Learn how use the CAT functions in SAS to join values from multiple variables into a single value.
Find more tutorials on the SAS Users YouTube channel.