statistic

Statistic

文系エンジニアが統計学の学習がてらにつくったgemです。

現在実装済みの機能

• 平均
• 偏差
• 分散
• 正規分布
• 95%信頼区間判定

Installation

Add this line to your application's Gemfile:

gem 'statistic'

And then execute:

$ bundle

Or install it yourself as:

$ gem install statistic

Usage

TODO: Write usage instructions here

ary = [6,4,6,6,6,3,7,2,2,8]

sd = Statistic::StandardDeviation.new(ary)


# 標準偏差
sd.calc
=> 2

# 95%信頼区間内判定
@sd.within_95_percent?(1.0)
=> true

@sd.within_95_percent?(0.9)
=> false

@sd.within_95_percent?(9.0)
=> true

@sd.within_95_percent?(9.1)
=> false

# 平均
sd.average
=> 4

# 偏差
sd.average
=> [1, -1, 1, 1, 1, -2, 2, -3, -3, 3]

# 分散
sd.variances
=> 4

統計についてメモ

偏差

各データの平均からの差分

分散

偏差の二乗の平均

標準偏差

分散の平方根 (≒ 偏差の絶対値の平均)

95%信頼区間

標準偏差の2倍の範囲内にそのデータが入るか否か

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/[USERNAME]/statistic. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.

License

The gem is available as open source under the terms of the MIT License.

Code of Conduct

Everyone interacting in the Statistic project’s codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.