# QCD3

QCD3-func

## Description

This function returns a factor. (Quality Control D3 Factor)

It determines the 3-sigma lower control limit for R charts (Range of Sample Charts) from the average range when the sample size (or subgroup size) **n** is given.

The Lower Control Limit for R = (factor)*(Average Range).

The calculations for the factors are based on the normal distribution.

## Syntax

double QCD3(int n)

## Parameter

**n**

- Sample size

## Return

Returns Quality Control D3 Factor.

## Examples

QCD3(11) = ; //returns 0.256, the factor for a sample size of 11

## See Also

QCD2, QCD4