module Statistical::ArrayExtensions
Module to contain all Array refinements
Public Instance Methods
mean()
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# File lib/statistical/core_extensions.rb, line 29 def mean sum.fdiv(count) end
pvariance()
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Population variance
# File lib/statistical/core_extensions.rb, line 34 def pvariance map { |x| (x - mean)**2}.sum.fdiv(count) end
sum()
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# File lib/statistical/core_extensions.rb, line 25 def sum inject(:+) end
svariance()
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Sample variance
# File lib/statistical/core_extensions.rb, line 39 def svariance map { |x| (x - mean)**2}.sum.fdiv(count - 1) end