COEFVARPCT(numeric_exp) and COEFVARPCTP(numeric_exp)
Returns the Coefficient of Variation in Percentage for the Population of numeric_exp.
Description
When the averages for two or more different samples are not equal, you need a measure of relative dispersion. CONNX offers two options:
COEFVARPCT - Coefficient of Variation Percentage for the sample.
This function yields information about the sample standard deviation relative to the mean.
COEFVARPCTP - Coefficient of Variation Percentage for the Population.
This function yields information about the standard deviation relative to the mean.
Both functions can be thought of as the magnitude of standard deviation (sample of it in the case of COEFVARPCT). Both qunatities are dimensionless and have the advantage of being independent of the units of measurement. They are calculated like this:
The population coefficient of variation percentage is the standard deviation of the sample (or the whole population in the case of COEFVARPCTP) divided by the mean, expressed as a percentage.
Parameters
numeric_exp must be a number, or a numeric expression.
Comments
You should use COEFVARPCTP only when you use observations for the entire population. Use COEFVARPCT when you use observations from a sample from the population.