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https://github.com/akamud/wilson-score-csharp
C# implementation of the Wilson Score
https://github.com/akamud/wilson-score-csharp
c-sharp dotnet nuget
Last synced: about 2 months ago
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C# implementation of the Wilson Score
- Host: GitHub
- URL: https://github.com/akamud/wilson-score-csharp
- Owner: akamud
- License: mit
- Created: 2014-12-24T01:12:17.000Z (about 10 years ago)
- Default Branch: master
- Last Pushed: 2022-06-06T15:15:52.000Z (over 2 years ago)
- Last Synced: 2024-12-15T02:48:38.874Z (about 2 months ago)
- Topics: c-sharp, dotnet, nuget
- Language: C#
- Homepage:
- Size: 94.7 KB
- Stars: 10
- Watchers: 3
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
README
Wilson Score for C# 
===================
You shouldn't use average for your scores.
Here's why:
Item A has 900 upvotes and 100 downvotes, resulting in an average of 90% likes.
Item B just came up in your database, it has 1 upvote and 0 downvotes, resulting in 100% likes! Woot!
Now Item B will come first than Item A. That's not what you want, is it?
That's exactly the problem that [Wilson Score](http://en.wikipedia.org/wiki/Binomial_proportion_confidence_interval#Wilson_score_interval) solves.
I found out about this on '[How Not To Sort By Average Rating](http://www.evanmiller.org/how-not-to-sort-by-average-rating.html)'. Give it a read.
**Tl;dr**: Wilson Score takes into account that a higher number of votes has more chance to be a correct representation of the general opinion. It basically answers the question: **Given the ratings I have, there is a 95% chance that the "real" fraction of positive ratings is at least what?**
If you still think you should sort by average, know that Reddit [uses](http://amix.dk/blog/post/19588) this on "best" sorting. [Yelp](http://officialblog.yelp.com/2011/02/the-most-romantic-city-on-yelp-is.html) too.
Using WilsonScore in your C# projects
=========
Nuget package available [here](https://www.nuget.org/packages/WilsonScore/), install it with
```
PM> Install-Package WilsonScore
```
Using it is as simple as you would expect:
```C#
Wilson.Score(upvotes, total);
```
By default it uses 90% confidence `(z = 1.644853)`. If you want to change the confidence, you can pass a third parameter, like so:
```C#
Wilson.Score(upvotes, total, 1.96); // 95% confidence
// or
Wilson.Score(upvotes, total, 2.326348); // 99% confidence
```
Using Wilson Score on the case mentioned at the start would give these values:
Item | Average Score | Wilson Score
:----: | :-------: | :------------:
Item A | 90% | 88.32%
Item B | 100% | 26.98%
Wilson Score puts Item A in a better position, now everyone is happy.
Right now that's all it does, and that's probably all you need anyway.
Supported Platforms
==========
.NET Framework 4+
Silverlight 5+
Windows 8+
Windows Phone 8.1+
Windows Phone Silverlight 8
Xamarin.Android
Xamarin.iOS
Notes
==========
Based on the [javascript version](https://github.com/math-utils/wilson-score) by [Jonathan Ong](https://github.com/jonathanong).
[MIT License](https://github.com/akamud/wilson-score-csharp/blob/master/LICENSE)