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class Odds | |
def initialize | |
@teams = {ari: 1998, atl: 1871, bal: 1901, bos: 1901, chc: 1874, cws: 1901, | |
cin: 1882, cle: 1901, col: 1993, det: 1901, fla: 1993, hou: 1962, | |
kan: 1969, laa: 1961, lad: 1884, mil: 1969, min: 1901, nym: 1962, | |
nyy: 1901, oak: 1901, phi: 1883, pit: 1882, sd: 1969, sea: 1977, | |
sf: 1883, stl: 1882, tb: 1998, tex: 1961, tor: 1977, was: 1969} | |
end | |
def tally_teams_given_year(year) | |
@teams.values.select { |y| y <= year }.count | |
end | |
def probability_of_losing_between_years(begin_year, end_year) | |
(begin_year..end_year).reduce(1.0) do |accum, el| | |
tally = tally_teams_given_year(el) | |
tally > 1 ? accum * ((tally - 1.0) / tally) : accum | |
end | |
end | |
end |
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