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https://github.com/magnusvk/wilson_interval

Calculate Wilson confidence intervals with minimum fuss.
https://github.com/magnusvk/wilson_interval

Last synced: 4 days ago
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Calculate Wilson confidence intervals with minimum fuss.

Host: GitHub
URL: https://github.com/magnusvk/wilson_interval
Owner: magnusvk
License: mit
Created: 2013-08-06T14:29:25.000Z (over 11 years ago)
Default Branch: master
Last Pushed: 2013-08-06T14:39:33.000Z (over 11 years ago)
Last Synced: 2024-12-28T19:29:41.282Z (12 days ago)
Language: Ruby
Size: 125 KB
Stars: 3
Watchers: 2
Forks: 0
Open Issues: 0
Metadata Files:
- Readme: README.md
- License: LICENSE.txt

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README

# wilson_interval

Calculate Wilson confidence intervals with minimum fuss.

## Usage

You always need to specify ```:total``` and ```:confidence```. You also need to specify *either* ```:p_hat``` *or* ```:successes```. The ```:confidence``` option is optional and defaults to ```0.95```.

```ruby
wilson = Wilson::Interval.new(p_hat: 0.5, total: 1000, confidence: 0.95)
wilson.lower_bound.round(4) => 0.4691
wilson.upper_bound.round(4) => 0.5309

wilson = Wilson::Interval.new(successes: 500, total: 1000, confidence: 0.95)
wilson.lower_bound.round(4) => 0.4691
wilson.upper_bound.round(4) => 0.5309
```

## Credits

Based on code found at [evanmiller.org](http://www.evanmiller.org/how-not-to-sort-by-average-rating.html). Adapted according to [Wikipedia](http://en.wikipedia.org/wiki/Binomial_proportion_confidence_interval#Wilson_score_interval).

## Contributing to wilson_interval

* Check out the latest master to make sure the feature hasn't been implemented or the bug hasn't been fixed yet.
* Check out the issue tracker to make sure someone already hasn't requested it and/or contributed it.
* Fork the project.
* Start a feature/bugfix branch.
* Commit and push until you are happy with your contribution.
* Make sure to add tests for it. This is important so I don't break it in a future version unintentionally.
* Please try not to mess with the Rakefile, version, or history. If you want to have your own version, or is otherwise necessary, that is fine, but please isolate to its own commit so I can cherry-pick around it.