I think your calculations are incorrect. PA = plate appearances. In baseball a Plate Appearance happens only on a hit, or an out. If he walks a PA is not recorded. Your software seems to want PA’s to include walks.

You are confusing Plate Appearances (PA) with At Bats (AB). AB's are calculated from PA's.

From this Wikipedia Article:

AB—At bat: Batting appearances, not including bases on balls, hit by pitch, sacrifices, interference, or obstruction.

PA—Plate appearance: number of completed batting appearances.

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