## ashokgit/zipfdistributiongenerator

A PHP Library for Generating Zipf Distribution

0.0.3
2018-04-30 17:48 UTC

Requires

- php: ^5.6.0 || ^7.0

This package is **not** auto-updated.

Last update: 2020-11-14 08:50:05 UTC

# README

A PHP Library for Generating Zipf Distribution

## Wikipedia Definition

https://en.wikipedia.org/wiki/Zipf%27s_law Zipf's law (/ˈzɪf/) is an empirical law formulated using mathematical statistics that refers to the fact that many types of data studied in the physical and social sciences can be approximated with a Zipfian distribution, one of a family of related discrete power law probability distributions. Zipf distribution is related to the zeta distribution, but is not identical.

## Installation

composer require ashokgit/zipfdistributiongenerator

## Usage

```
<?php
require 'vendor/autoload.php';
use ashokgit\ZipfDistributionGenerator;
$noOfItems = 10;
$zipf = new ZipfDistributionGenerator;
$zipf->size = 10;
$zipf->skew = .5;
$zipf->generate();
$probability = [];
for ($i = 1; $i < $noOfItems; $i++) {
$probability[] = $zipf->getProbability($i);
}
print_r($probability);
```

## Result: a Zipf's Distribution over 10 items

```
Array
(
[0] => 0.35348576237902
[1] => 0.17674288118951
[2] => 0.11782858745967
[3] => 0.088371440594754
[4] => 0.070697152475803
[5] => 0.058914293729836
[6] => 0.050497966054145
[7] => 0.044185720297377
[8] => 0.039276195819891
[9] => 0.035348576237902
)
```