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Thursday, July 23, 2009
What does tOPS+ mean?
OPS you all know: OBP + SLG
OPS+ you might know, or think you know: OBP/lgOBP + SLG/lgSLG - 1
tOPS+ you might know, but most probably don’t: OPS+ in a particular context divided by your overall OPS+
Jim Rice, to pick someone not at all at random has an overall OPS+ of 128. His Home tOPS+ is 115 and his Road tOPS+ is 85. (Seeing that he played a virtually equal number of games at home and on the road, these two numbers must be equidistant from 100.)
But, what was Rice’s OPS+ on the road? Well, all you have to do is multiply any of his tOPS+ split numbers by 1.28 (since to get your tOPS+ number, you had to divide by 128). Rice’s OPS+ on the road is therefore 85*1.28 = 109, and his home OPS+ was 147.
Now, this may be a bit tricky, but that 147 is NOT necessarily a product of Fenway Park. Remember that OPS+ adjusts for the league and park you play in. Theoretically (as best as I can understand this), the OPS+ of Redsox hitters at home and on the road should be (overall) pretty much identical (if not in each year, likely for any five-year time period).
So, what Rice’s 147 OPS+ at home suggests is that he took exceptional advantage of his home park.
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This fellow here however knows enough about OPS+ to be too dangerous. I don’t blame him necessarily. But, he came out guns blazing too fast for something that is not readily apparent what it means. I do know that on other pages Sean shows sOPS+ that would have shown the 109 for Rice’s road OPS+. I don’t know why it doesn’t appear on this particular page.
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In any case, OPS+ is not a great measure. Well, it’s decent, but it does not deserve the prominence that b-r.com is giving it.
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