Use this calculation to reproduce a defined quantitative method when the observations, units, sampling process, and assumptions match the method shown here.

First quartile

Required number.

Third quartile

Required number.

The cited overview of Quartile coefficient of dispersion supplies background for the terminology and domain context used by this tool.^[1]

Calculate quartile dispersion from first and third quartiles. Inputs are interpreted exactly in the displayed units and the calculation returns the following fields without presentation rounding.

Quartile coefficient of dispersion

Returned number.

• A numerical result does not by itself establish data quality, causation, representativeness, independence, distributional fit, or practical significance.
• Use finite inputs in the displayed units, preserve source measurements and assumptions, and independently verify consequential decisions.

Inspect the underlying data, visualize its distribution, report uncertainty and sample size, and compare the result with a robust or domain-specific method where appropriate.

• Quartile Deviation Calculator

  Calculate the semi-interquartile range, half the distance between the inclusive third and first quartiles.

• Interquartile Mean Calculator

  Calculate the mean of the values between the inclusive first and third quartiles, ignoring outside extremes.

• Midhinge Calculator

  Calculate the midpoint of the inclusive first and third quartiles of a dataset.