Personal Catchers for the Houston Astros
Catchers and pitchers who tended to start together for the Houston Astros
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Includes all games played 1962-2010.
Selected according to the formula (M – P * C / T) >= 6, where T = team games, P = games started by the pitcher, C = games started by the catcher, and M = mutual starts by the pitcher and catcher. In essence, any battery which started together 6 more times than would have been expected if their individual starts had been distributed randomly is considered to include a personal catcher.
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