dopester noun a person who analyzes the past performance of racehorses and athletic teams in order to predict future performance US,1907
That is, these excellent dopesters can, presumably, assess the real probability (as opposed to the subjective, pari-mutuel probability) that horse H will finish first[.] — Richard A. Epstein, TheTheoryofGambling andStatisticalLogic, p. 291, 1977