Hello.
What is the syntax of first argument (op) in sumifop(op, val1, val2,..)?
docs.limesurvey.org/Expression+Manager#Implemented_Functions
My answer label set is composed of a few "valid" results (eg 0->4) and a few possible answers that should give me different "error codes", such as "I don't know" or "not applicable" or "I don't understand the question".
I would like to sum up the answers of different questions using the same set, excluding automatically the error codes.
I guess one possible way is to associate to error codes negative values, and filter them out of the sum using sumifop, as in:
{sumifop(">0",Q1.value,Q2.value,Q3.value)} ... but I cannot figure the syntax of the first "op" argument: with hyphen it does not filter, without hyphens it does not parse.
Any pointer welcome, thanks.
Bebs.