The general coefficient is the average deviation of individual assessment-sales ratios from the overall average assessment-sales ratio of all sales occurring in a taxing district without regard to any property characteristics.

The stratified coefficient of deviation is the average deviation of individual assessment-sales ratios for all useable sales occurring within a particular property class from the average assessment-sales ratio for that class.

The segmented coefficient of deviation is the average deviation of individual assessment-sales ratios within a particular class of property from the average assessment-sales ratio for all sales of properties occurring within a taxing district.