http://salon.com/sports/col/kaufman/2006/09/14/thursday/index1.html In May, the Cubs were 2-18 when Perez played, but they were 5-4 -- they were a winning team! -- when he stayed in the dugout. That is a colossal Neifi Index of .446. To give you some context, the difference between the winning percentages of the best and worst teams in baseball, the New York Yankees and Kansas City Royals, is .227. And Neifi Perez, one guy, made almost twice that difference for the Cubs! And don't talk to me about small sample size. You don't need large sample sizes to know about the Neifi Effect.