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https://github.com/Nephos/stats
An expressive crystal implementation of statistical distributions and usual math functions. :bar_chart:
https://github.com/Nephos/stats
statistical-distributions statistics
Last synced: about 2 months ago
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An expressive crystal implementation of statistical distributions and usual math functions. :bar_chart:
- Host: GitHub
- URL: https://github.com/Nephos/stats
- Owner: Nephos
- License: gpl-3.0
- Created: 2016-06-27T13:41:14.000Z (over 8 years ago)
- Default Branch: master
- Last Pushed: 2020-05-20T00:02:39.000Z (over 4 years ago)
- Last Synced: 2024-08-01T00:41:17.600Z (4 months ago)
- Topics: statistical-distributions, statistics
- Language: Crystal
- Homepage: https://git.sceptique.eu/Sceptique/stats
- Size: 101 KB
- Stars: 31
- Watchers: 3
- Forks: 2
- Open Issues: 1
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
- awesome-crystal - stats - An expressive implementation of statistical distributions (Science and Data analysis)
README
**Migrated to **
# stats
An expressive implementation of statistical distributions.
Compatible with crystal v0.27.0.
## Installation
Add this to your application's `shard.yml`:
```yaml
dependencies:
stats:
git: https://git.sceptique.eu/Sceptique/stats
```
## Usage
### Include it
```crystal
require "stats"
include Stats
```
### Normal distribution
```crystal
NormaleDistribution.between # less_than, greater_than
standard_deviation: 15,
esperance: 100,
min: 85,
max: 115
# => 0.6826894921370859
```
### Binomial distribution
```crystal
Math.binomial_distribution(
tries: 3,
probability: 0.5,
success: 1)
# => 0.375
```
### Binomial coefficient
```crystal
Math.coef_binomial(5, 2) # => 10
```
### Factorial
```crystal
Math.factorial(4) # => 24
```
### Radian and degree
```crystal
90.radian # => (Math::PI / 2)
(Math::PI / 4) # => 45.0
```
### Series & Statistics
```crystal
[1, 2, 3].mean # => 2.0
[1, 2, 3].variance # => 0.6667
[1, 2, 3].standard_deviation # => 0.8165
[1, 2, 3].quadratic_mean # => 2.16
[2, 32].geometric_mean # => 8.0
[40, 60].harmonic_mean # => 48.0
[1,2,3,2,1].macd 3 # => [2.0, 2.333, 2.0]
```
### Correlations
```crystal
[1,2,3,4].covariance [4,2,1,0] # => -1.625
[1,2,3,4].correlation_coef [1,2,3,3] + 1 > 1.5 # => true
[1,2,3,4].correlation_coef [-14,14,101,-100] + 1 > 1.5 # => false
```
### Median
```crystal
[1, 2, 5].median # => 2.0
[42, 1337].median # => 685.5
```
### Quartiles & Boxplot
*Note: not big compatible yet*
```crystal
[1, 3, 5].first_quartile # => 2.0 (alias of lower_quartile)
[1, 3, 5].second_quartile # => 3.0 (alias of median)
[1, 3, 5].third_quartile # => 4.0 (alias of upper_quartile)
[1, 3, 5].quartiles # => [2.0, 3.0, 4.0] ([Q1, Q2, Q3])
```
```crystal
arr = [-23, -5, 2, 5, 5, 6, 7, 8, 14, 15, 42, 1337]
arr.first_quartile # => 3.5 (Q1)
arr.second_quartile # => 6.5 (Q2)
arr.third_quartile # => 14.5 (Q3)
arr.interquartile_range # => 11.0 (alias of iqr) (IQR = Q3 - Q1)
# Tukey's fences with k = 1.5 (default parameter value)
arr.lower_fence # => -13.0 (Q1 - 1.5 * IQR)
arr.upper_fence # => 31 (Q3 + 1.5 * IQR)
arr.lower_outliers # => [-23]
arr.upper_outliers # => [42, 1337]
# Tukey's fences with k = 3 for "far out" outliers
arr.upper_fence(3) # => 47.5 (Q3 + 3 * IQR)
arr.upper_outliers(3) # => [1337]
```
### Frequency
```crystal
[0, 1, 2, 3].frequency_of(0) # => 0.25 (amount of X in the population, by the size of the population)
[0, 0, 1, 2, 3].all_frequencies # => { 0 => 0.4, 1 => 0.2, 2 => 0.2, 3 => 0.2}
```
## Development
- The lib should take care of "big" numbers
## Contributing
1. Fork it ( https://github.com/Nephos/stats/fork )
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create a new Pull Request
## Contributors
- [Nephos](https://github.com/Nephos) Arthur Poulet - creator, maintainer