Since the 1980s, sabermetricians have used a summary statistic different from batting average to evaluate

players. They realized walks were important and that doubles, triples and HR, should be weighed more than

singles. As a result, they proposed the following metric:

BB Singles + 2Doubles + 3Triples + 4HR

PA + AB

They called this on-base-percentage plus slugging percentage (OPS). Although the sabermetricians probably

did not use regression, here we show how this metric is close to what one gets with regression.

1. Compute the OPS for each team in the 2001 season. Then plot Runs per game versus OPS.