# Probability Density Function

Truncated normal distribution probability density function (PDF).

A normally distributed random variable `X`

conditional on `a < X < b`

is called a truncated normal distribution.
The probability density function (PDF) for a truncated normal random variable is

where `Phi`

and `phi`

denote the cumulative distribution function and density function of the normal distribution, respectively, `mu`

is the location and `sigma > 0`

is the scale parameter of the distribution. `a`

and `b`

are the minimum and maximum support.

## Usage

```
var pdf = require( '@stdlib/math/base/dists/truncated-normal/pdf' );
```

#### pdf( x, a, b, mu, sigma )

#### pdf.factory( a, b, mu, sigma )

## Examples