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Why do some players have an "extra-large" positional adjustment?

+1 vote
I was looking at WAR calculations on the site, and I saw that -- according to the glossary -- the Tango-derived +12.5-C, +7.5-SS, +2.5-2B, etc. positional adjustments are applied to WAR, and scaled to 162 games.

Then I saw that some players, ones who played the entire season at the same position, snagged a higher-than-normal positional number. For example, Derek Jeter has never played any position other than shortstop. The glossary states that a 162-game season means a +7.5 positional adjustment. In 1996, Jeter played less than 162 games (157, in fact), but gets a positional adjustment of +8.5 for the regular season. Why is that?
asked Jan 7, 2013 in Sabermetrics by Bryan Grosnick (12 points)

1 Answer

0 votes
Two things, one of which I'm 100% sure of.  First, defensive games are a statistical measure involving total balls hit towards that fielder, not actual games played, starts, or innings.

Second, positional adjustments have changed over time.  Those adjustments stated are current, but they use different ones for past eras.  It looks like infield play was more important, thus the higher adjustment.  Looking at A-Rod's and Nomar's pages, I'm seeing the same thing.  I'm not totally sure, but that's my best guess.
answered Jan 8, 2013 by LeeTro (264 points)