Today's math challenge. So if I do a quantified self app, I might want to take a daily survey, eg. 20 question Likert scale. But from day to day, the answers might be the same. I could just have a button to repeat yesterdays answers. OR
I could do a t-test or wilcoxon test as the Qs are being reasked and if it appears they're the same, then assume the rest are the same. Will it work? Maybe. It would reduce data entry & maximize the risk of missing a small day to day change.