The Absolute Measure of DispersIon : A measure of dispersion expressed In the same units in which the observations of the data are expressed Is called an absolute measure of dispersion. If the unit of the observations of the data is cm. the absolute measure of dispersion Is expressed In cm. it cannot be used for comparing the dispersion of two or more groups with different units.
The Relative Measure of Dispersion : A measure of dispersion which Is free from the unit of measurement Is called the relative measure of dispersion. The variability of two or more sets of data having different unit of measurement can be compared by relative measure of dispersion. It Is the ratio of the absolute measure of dispersion and the measure of average. i.e..
Relative measure of dispersion = \(\frac{absolute\, measure \,of \,dispersion} { average}\)
