## Quartile Deviation for ungrouped data

Use this calculator to find the Quartile Deviation (QD) for ungrouped (raw) data.

Quartile Deviation Calculator | |
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Enter the X Values (Separated by comma,) | |

Results | |

Number of Obs. (n): | |

Ascending order of X values : | |

First Quartile :$Q_1$ | |

Second Quartile :$Q_2$ | |

Third Quartile :$Q_3$ | |

Quartile Deviation :$QD$ | |

Coeff. of QD : | |

## Quartile Deviation for ungrouped data

## Formula

The quartile deviation is given by

`$QD=\dfrac{Q_3-Q_1}{2}$`

and the coefficient of quartile deviation is given by

### Coeff. of `$QD=\dfrac{Q_3-Q_1}{Q_3+Q_1}$`

where

- $Q_1$ is the first quartile of the data
- $Q_3$ is the third quartile of the data