Finally is a little saying my con law professor at Yale had about judges who dive too deeply into arcana like school-funding ratios or statisticalmodels purporting to show racial discrimination in capital punishments.
In statistics, the coefficient of determination, denoted R2 and pronounced R squared, is used in the context of statisticalmodels whose main purpose is the prediction of future outcomes on the basis of other related information.
CNN's projection is based on precincts reporting results, entrance polls and other statisticalmodels -- including the number of votes outstanding in areas where Clinton was expected to do well.