# Distribution Functions

This topic explains how the Distribution Function operation works

We support the following distributions:

## Connector Parameters

Each distribution connector takes in two parameters, `function`

and `value`

.

### Function

For the `function`

parameter, you can select `"CDF"`

to use the cumulative density function, `"PDF"`

to use the probability density function, or `"PPF"`

to use the percentile point function. You can also select `"SF"`

for the survival function, which is 1 minus the CDF.

### Value

The `value`

parameter determines the value at which to call the selected function. If `"PPF"`

is selected, the value must be between 0.0 and 1.0.

## Input Specifications

The distribution parameters - like μ and σ for Normal Distribution - enter as time series inputs. These will often be provided as outputs of the NGBoost model connector. Our supported distributions use a location and scale parameter (for Normal distribution, μ is the location parameter, and σ is the scale parameter).

## Tutorial

See our Create a Price Forecast with Probabilistic Prediction tutorial for examples using the `LaplaceDistribution`

operation connector.

Updated 8 months ago