module Ritsudo::Result::Helper
Public Class Methods
mean(values)
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# File lib/ritsudo/result/helper.rb, line 11 def self.mean(values) sum = values.sum(0.0) mean = sum / values.size end
remove_outliters(values, stdev_multiple)
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# File lib/ritsudo/result/helper.rb, line 4 def self.remove_outliters(values, stdev_multiple) stdev = standard_deviation(values) mean = mean(values) range = (mean - (stdev * stdev_multiple))..(mean + (stdev * stdev_multiple)) values.select { |v| range.cover?(v) } end
standard_deviation(values)
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# File lib/ritsudo/result/helper.rb, line 21 def self.standard_deviation(values) Math.sqrt(variance(values)) end
variance(values)
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# File lib/ritsudo/result/helper.rb, line 16 def self.variance(values) total = values.inject(0) { |sum, v| sum + ((v - mean(values)) ** 2) } total.to_f / (values.size - 1) end