Scott is using an excel spreadsheet with established formulas to translate ZiPS(u) into player ratings. Thus, it will take the preseason ZiPS projections and make small adjustments based on how players are doing this season.
It will just correct for the projected ratings which were a little too far off. For instance, ZiPS seemed to love Brad Emaus and Millone, rating them better than it should have...ZiPS(u) corrects that and others such as Adam Dunn (still a walk, strikeout, HR guy but hitting .210 instead of .175, estimates).

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