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Don’t Knock Curtis, Even if He Isn’t Knocking It Out of the Park July 8, 2015

Posted by tomflesher in Baseball.
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Curtis Granderson has, for some reason, developed a reputation as a streaky hitter. For example, Adam Rubin opened this article from June 27 commenting on it, although the thrust of the article was Granderson’s defensive issues. Amazin’ Avenue was justifiably a bit more nuanced, describing Curtis’s change of approach at the plate as a favorable influence on Mets scoring. What’s surprising to me is that Granderson’s hitting has been described as a ‘streak.’

2015-07-08 Granderson’s hitting was unpredictable at the beginning of the season, certainly, but those sorts of fluctuations are natural with a small sample size. What’s visible from the time-series chart of Granderson’s first 85 games should be two things: his batting average has improved, and his hitting has been consistent if not trending upward.

Some rudimentary data analysis bears that out. A time-series regression of batting average on game number shows an intercept of .148 and an increase of .0016 per game, both significant at the 99% level (showing a bad start and a slow but steady increase). However, Granderson’s hitting is coming at the expense of his OBP, which showed a 99%-significant .360 intercept and a 95%-significant decrease of .0002 each game. The fluctuation of OBP, which is almost certainly due to his high proportion of walks at the beginning of the season, is about an eighth of the increase in batting average; Curtis’ consistent production can be counted on, whether the rest of the team contributes or not.

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