Quartile Deviation for grouped data
Use this calculator to find the Quartile Deviation for grouped (frequency distribution) data.
| Quartile Deviation Calculator (Grouped Data) | |
|---|---|
| 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
