An open-source collection of Probability distribution functions.

Installation

This is a Node.js module available through the npm registry.

Before installing, download and install Node.js. Node.js 0.10 or higher is required.

If this is a brand new project, make sure to create a package.json first with the npm init command.

Installation is done using the npm install command:

$ npm install probabilis

Features / Distributions included

Probabilis contains a wide-range of distribution functions:

• Binomial Distribution
• Negative Binomial Distribution
• Bernoulli Distribution
• Geometric Distribution
• Exponential Distribution
• Poisson Distribution

Even more to come!

Usage Example

const probabilis = require('probabilis')


let result = probabilis.Binomial(2, 1, 0.5)

//let result = probabilis.NegativeBinomial(2, 1, 0.5) - Another Example


console.log(result)

Full API

Reference

• n - Number of occurences
• k - kth occurence
• p - Probability of 1 occurence (Probability of success in other distributions like Bernoulli's)
• s - Discrete value (0 - failure, 1 - success)
• x - A discrete value
• gamma - Mean value

1. Binomial Distribution

Binomial(n, k, p)

2. Negative Binomial Distribution

NegativeBinomial(n, k, p)

3. Bernoulli Distribution

Bernoulli(p, s)

4. Geometric Distribution

Geometric(x, p)

5. Exponential Distribution

Exponential(gamma, x)

6. Poisson Distribution

Poisson(gamma, x)

License

MIT