Date:         Wed, 21 Sep 2011 14:05:06 -0400
Reply-To:     Mary Rosenbloom <mary.rosenbloom.sas@GMAIL.COM>
Sender:       "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From:         Mary Rosenbloom <mary.rosenbloom.sas@GMAIL.COM>
Subject:      sum(of card: ) this works but I can't find documentation for it

Hi all,

I have several variables, all having the prefix "CARD", and all having
values of 1 or missing.  I want to create one more variable, "not
answered" which will take the value of 1 if none of the other variables
have a value.

I decided to try this code, and it worked, but I can't find a reference
for it anywhere:

data try2;
   set try1;

   if sum(of card:) eq 0 then notanswered=1;
run;

Does anyone know of an example of this in the docs?  I am a little
hesitant to use this, since I can't turn on some analog of MPRINT to "see"
what is going on behind the scenes.

Thanks for your help.

Cheers,
Mary R.