## Quartile Deviation for grouped data

Use this calculator to find the Quartile Deviation for grouped (frequency distribution) data.

Quartile Deviation Calculator (Grouped Data) | |
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Type of Freq. Dist. | DiscreteContinuous |

Enter the Classes for X (Separated by comma,) | |

Enter the frequencies (f) (Separated by comma,) | |

Results | |

Number of Obs. (N): | |

First Quartile : ($Q_1$) | |

Second Quartile : ($Q_2$) | |

Third Quartile : ($Q_3$) | |

Quartile Deviation : $QD$ | |

Coeff. of QD : | |

## Quartile Deviation for grouped 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