Rstat
A very simple statistics gem.
Installation
$ gem install rstat
Usage
require 'rstat'
=> true
[1, 2, 3, 4, 5].mean
=> 3.0
Currently Adds
Arithmetic
- Sum
- Product
- Binomial Coefficient
Descriptive Statistics
Location
- Arithmetic Mean
- Geometric Mean
- Harmonic Mean
- Power Mean
- Median
- Mode
Dispersion
- Range
- Standard Deviation
- Coefficient of Variation
- Percentile
- Interquartile Range
Shape
- Variance
- Skewness
- Kurtosis
- Central Moments
- Raw Moments
Count Data
- Index of Dispersion
Regression Analysis
Linear Regression
- Simple Linear Regression
Running Tests
Rstat depends upon RSpec for its tests.
To run all the tests for the gem:
$ rspec spec
To run one particular spec file:
$ rspec spec/rstat/array_spec.rb
To run one particular line of a spec file:
$ rspec spec/rstat/array_spec.rb:177
Rstat has been tested with Ruby 1.8.7, 1.9.3, and 2.0.0. There's little reason it shouldn't work with other versions of Ruby though.
Console
Rstat includes a rake task to open up an irb session with the gem source preloaded. This is particularly useful if you're working with a local development copy of the gem's source and want to experiment with your changes. To use the preloaded console:
$ rake console
Contributing
If you feel like you can add something useful to Rstat then don't hesitate to send a pull request.
A Note of Warning
This gem extends the core Array class and Fixnum class. In isolation this is usually pretty harmless. But, in combination with other gems that do the same, unpredictable behavior may result. As always, use caution, and be aware of what this gem and any others you use actually do before including it in an important project.