I'm using this syntax to create data subsets for plots:  
subset=source=="Both". Now I would like to create a subset defined by 
two different variables like this: subset=source=="Both"  
subset=site=="home" but this syntax is not correct. The documents in the 
manual for subset seem to be creating whole new data files not just 
selecting rows based on the contents of the variables. How do I subset 
based on two variables.

-- 
Dean Sonneborn, MS
Programmer Analyst
Department of Public Health Sciences
University of California, Davis
(530) 754-9516


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