class Statistic::StandardDeviation
正規表現
Public Instance Methods
calc()
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正規分布
# File lib/statistic.rb, line 38 def calc variances ** (1 / 2.0) end
within_95_percent?(data)
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95%信頼区間: 正規分布の2倍の範囲内に入るかどうか
# File lib/statistic.rb, line 43 def within_95_percent?(data) within_n_deviation?(2, data) end
Private Instance Methods
within_n_deviation?(n, data)
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# File lib/statistic.rb, line 48 def within_n_deviation?(n, data) data_deviation = data - average square_and_square_root(data_deviation) <= calc * n end