But when a particular individual has even 1 answer with missing data I end up with missing data in the sum computed variable (makes sense).

I searched for an alternate method, and since missing data isn't actually more than even 5% per each individual I want to do the compute mean and multiply by case method posted here: http://core.ecu.edu/psyc/wuenschk/SAS/Help/Sum-SAS.htm

But the NMISS function in SPSS 17 (version I'm using) seems to be missing.

Any ideas?

Thanks!