Sha256: ffe304a49da16b5d6e52cf98724f20aabf9fe199fddc1e01023c372b4e02dba3
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Size: 320 Bytes
Versions: 41
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Stored size: 320 Bytes
Contents
require 'active_support/core_ext/enumerable'
module Enumerable
def mean
sum.to_f / length
end
def variance
m = mean
reduce(0) {|accum, item| accum + (item - m) ** 2}.to_f / (length - 1)
end
def stdev
Math.sqrt(variance)
end
def percentile(pc)
sort[(pc * length).ceil - 1]
end
end
Version data entries
41 entries across 41 versions & 2 rubygems