Deane: Normalized winning percentage

From SABR member Bill Deane at WordPress on February 9, 2020:

As we know, winning percentage is a less-than-reliable tool for rating pitchers, due mostly to its team-dependency. One prominent analyst even proposes abolishing pitchers’ wins and losses. But if we get rid of all baseball statistics which are not 100% reliable, we won’t have any stats at all.

Better to try and improve upon it, which I think I’ve done with a statistic I call “normalized winning percentage.” NWP projects how a pitcher might perform on a .500-team, thus putting all hurlers, past and present, on an even plane of comparison. I offer it as the ultimate tool for evaluating a pitcher’s ability to win.

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Originally published: February 12, 2020. Last Updated: February 12, 2020.