When the averages for two or more different samples are not equal you need a measure of relative dispersion. The Coefficient of Variation Percentage for the Population is such a measure. The Coefficient of Variation Percentage yields information about the Standard Deviation relative to the mean. Thus it could be thought of as the magnitude of the Standard Deviation. This quantity is dimensionless, and therefore has the advantage of being independent of the units of measurement. It is calculated as follows:
In other words, the population coefficient of variation percentage is the standard deviation of the population divided by the mean, expressed as a percentage.
numeric_exp must be a number, or a numeric expression.
COEFVARPCTP should be used only if we use observations for the entire population. For a sample from the population, use COEFVARPCT instead.