2. The data is incomplete. Most data sources don't include the number of Sacrifice Hits (SH) and Sacrifice Flies (SF) allowed by each pitcher. Because SH and SF aren't counted as at-bats, they need to be subtracted from the number of Batters Faced (BF) to calculate the Batting Average allowed by each pitcher. We estimate SH and SF allowed by each pitcher, causing the "BA vs. L/R" calculations to differ by a few points from other databases.
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