Mean vs. Median The mean and median are related but their mathematical analysis is quite different – the median’s is generally much harder. To see that consider…. n numbers The mean y minimizes The median y minimizes
Simpson’s Paradox Have to be careful..when aggregating/binning information…sometimes can lead to contradictory results.
1973 Berkeley Sex Bias Case App.% Adm Men844244% Women432135% MajorMenWomen App%AdmApp%Adm A82562%10882% B56063%2568% C32537%59334% D41733%37535% E19128%39324% F2726%3417% Even though in the overall case, Men had a higher admission rate, at the Major (School) Level, Women had a higher acceptance rate.