What does "mean=prop" mean in PROC MEANS?

[henryjing]

I saw following statment of PROC MEANS:

proc means data=train no print nway;
class EDUCATION;
var default;
output out=edu_level mean=prop;
run;

I wonder what does the "mean=prop" statement mean here in PROC MEANS? (I tried to google, but didn't find any information on that)

Thanks.

[RahulG]

Mean=prop. Here prop is variable name where mean value would be stored. 

For details refer to

http://www2.sas.com/proceedings/sugi27/p018-27.pdf