I bet we could do this (with less confidence, because of rare false positives) just by mass-comparing results across years. We collected a fair amount of stable information. Some other system would be nice, though, if it adds reliability and makes it easier for us to vary the survey format or contents over time.
I bet we could do this (with less confidence, because of rare false positives) just by mass-comparing results across years. We collected a fair amount of stable information. Some other system would be nice, though, if it adds reliability and makes it easier for us to vary the survey format or contents over time.