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Jeremy Giambi Effect

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The Jeremy Giambi Effect is a name given to the correlation between playing time and quality of performance. The Jeremy Giambi Effect has important implications for understanding a player's PECOTA forecast.

Following are Giambi's plate appearances and OPS for each year of his major league career

Year PA OPS
1998 70 .739
1999 336 .741
2000 302 .761
2001 443 .841
2002 397 .919
2003 156 .696

Note that the correlation between Giambi's PA and OPS is very strong (r=.72). He played more often when he played more effectively, and less so when he played less effectively. Eventually, his performance became so poor that he could no longer secure any major league playing time at all.

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