/obligatory SSS warning

]]>I strongly suspect that this is because home/road wRC+ splits are calculated using the wrong park factor. wRC+ is basically (wRC/avg wRC) plus a park correction, and we can calculate avg wRC as (wRC – wRAA), so a non-park-corrected wRC+ (call it wRC+’) is wRC/(wRC – wRAA). Iannetta’s splits are:

home: wRC = 140.6, wRAA = 34.9

road: wRC = 102.2, wRAA = -4.1

So:

home wRC+’ = 140.6/(140.6-34.9) = 133

road wRC+’ = 102.2/(102.2 + 4.1) = 96

His actual wRC+ splits are 121 and 83, so the park correction is subtracting about 12 or 13 points in each case. That implies that his average road park has the same park factor as Coors, which is clearly wrong. The same is true of his overall career numbers (wRC+’ 114, actual wRC 102), so it looks like his average park factor (roughly 50% Coors, 50% road parks) is being applied to his home/road splits.

]]>classic change of scenery trade so far, looks like.

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