Easily compute the Quartile Deviation (QD), Interquartile Range (IQR), and the Coefficient of Quartile Deviation for your dataset. This statistical calculator helps you analyze data dispersion and spread quickly and accurately.
Formula:
Key Formulas Explained
The Quartile Deviation (QD) is a measure of statistical dispersion, representing the average distance between the first and third quartiles. It is half the Interquartile Range (IQR).
- First Quartile (Q1): The value below which 25% of the data falls.
- Third Quartile (Q3): The value below which 75% of the data falls.
- Interquartile Range (IQR): The range between the third and first quartiles.
IQR = Q3 - Q1 - Quartile Deviation (QD): Half of the Interquartile Range.
QD = (Q3 - Q1) / 2 - Coefficient of Quartile Deviation: A relative measure of dispersion, useful for comparing variability between different datasets.
Coefficient of QD = (Q3 - Q1) / (Q3 + Q1)
To use the calculator, simply enter your data points, and it will compute these values for you.