Use statistics to find cheaters
November 14, 2011 4:08 AM Subscribe
What would be a good statistical approach to find manipulated test results?
posted by lord_yo to science & nature (10 answers total) 2 users marked this as a favorite
Let's say we have 100 schools with a total of ~10'000 students who have filled out a test. Now you want to find out if in some of the clusters, the answers were manipulated by the teachers to improve the scores for their school.
What would be a good statistical approach for this?
Manipulated tests would have a high number of similar, high scores within a school. So I thought the average intercorrelation of scores within a test for each cluster might give me some insights. I'm not sure if Cronbach's Alpha or another internal consistency score would help here.
What do you think?