README.md in standard_deviation-1.0.0 vs README.md in standard_deviation-1.0.1
- old
+ new
@@ -1,9 +1,11 @@
# Native Standard Deviation
An implementation of the standard deviation calculation in C, with much better performance (50x-100x) than using pure ruby.
+[](http://travis-ci.org/reu/standard_deviation)
+
## Installation
Add this line to your application's Gemfile:
gem 'standard_deviation'
@@ -30,9 +32,10 @@
``` ruby
[1, 2, 3, 4, 5].stdevp => 1.4142135623730951
```
Also, the API exposes the `sample_variance` and `population_variance` calculations:
+
``` ruby
[1, 2, 3, 4, 5].sample_variance => 2.5
[1, 2, 3, 4, 5].population_variance => 2.0
```