# coefficient of dispersion

## coefficient of dispersion

the variance divided by the mean. Where this value is equal to 1 there is a random or POISSON DISTRIBUTION; greater than 1 aggregation or under-dispersion, and a value smaller than 1, indicates an even distribution or over-dispersion (e.g. territoriality in birds).
References in periodicals archive ?
The coefficient of dispersion measures the horizontal uniformity of assessments.
The coefficient of dispersion for CAUV assessments is 43.
A useful measure of accuracy is the coefficient of dispersion (COD), which is the average error (average residual) produced by the regression estimates; the COD equals the median residual/median selling price.
He devotes considerable attention to discussing the most accepted measure of assessment uniformity: the coefficient of dispersion (COD).
If the goal is to examine property valuation conclusions, then statistics such as the coefficient of variation (COV) and coefficient of dispersion (COD) are preferred over general statistical measures of fit such as R-square.
The coefficient of variation (COV) is the standard error of the estimate divided by the mean value of the dependent variable; a measure of the relative chance for error in a forecast or estimate of the dependent variable; the coefficient of dispersion (COD) is the ratio of a measure of absolute dispersion to the appropriate average, usually expressed as a percentage; computed from either the quartile or the mean deviation, but usually expressed as a ratio of the standard deviation to the mean; a measure of relative dispersion.
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