BBPCTBlocking, Bracing, Packing, Crating & Tie-Down
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Scully includes the additional variables NL, to account for higher revenues of the superior National League, STD, equal to one for older stadiums with inadequate parking in poor neighborhoods, and BBPCT, the percentage of black players on the team.
(16) BBPCT was included because previous studies conducted by Scully showed the existence of racial discrimination by baseball fans.