We conducted a maxdiff study in sawtooth, and generated the paper and pencil survey along with the accumulate data csv file template.
Once we got the results, we pasted it into the accumulate data file, and assigned a respondent# to each case. However when we tried to import the data to sawtooth, it keeps popping up a error said "the key is already associated with an element of this collection", and would not import the results.
Does anyone have an idea what should we do to fix it?
Thank you for helping.