Nineteen counties have coefficients of dispersion for residential properties greater than 15 percent. Fourteen counties meet this standard. The two main reasons why Appraisal districts need to consistently assess all property at 100% of market value. Counties with 50,000 or less inhabitants: Three year average of the median level of assessment – not more than 35.33% and not less than 31.33% of fair cash value of property within the assessment jurisdiction. 6, pp. Equity - Is measured by the coefficient of dispersion (COD). For improved residential property, it should be 0=<15%. 48, pp. Gastwirth (1982), "Statistical properties as a measure of tax assessment uniformity", Journal of Statistical Planning Inference, Vol. (See Property Tax Statistics, Sales Ratio and Equalization Tables.) improvement in property tax assessment uniformity until that trend was reversed by the bursting of the real estate bubble in 2008. The COD should be 0=< on improved residential property and 0=<20% on all other classes. The Kansas Constitution requires that all taxable Reference: Bonett and Seier (2005), "Confidence interval for a coefficient of dispersion in nonnormal distributions", Biometrical Journal, Vol. that result by the number of ratios. Fundamental to the administration of the property tax is the concept that all property should be appraised and assessed on a uniform basis. The IAAO Standard suggests that residential properties have a coefficient of dispersion less than 15 percent. and the coefficient of dispersion (COD) which is used in setting the education tax rates. Acceptable coefficients of dispersion depend on property type but should typically be 20% or less. Under Berrios, the average coefficient of dispersion for first-pass valuations of commercial and industrial properties during the study period was 98, nearly five times the standard of 20. Coefficient of variation is calculated by dividing the standard deviation by the mean or average ratio and multiplying by 100. Coefficient of Dispersion - The relative dispersion or variability of assessments from the median. 144-148. The Illinois What Is a Reappraisal? Washington Department of Revenue Property Tax Division Annual Valuation Team (360) 534-1362 10/02/12 4 The coefficient of dispersion (COD) is the most used measure of uniformity in ratio studies, and the only other one we will be discussing today. The Kansas Constitution requires that all taxable A coefficient of dispersion (COD) not greater than 15.00%. The IAAO suggested coefficient of dispersion for nonresidential property is 20 percent or less. Property Tax Fiduciary 1.11. 1-12. Applications: Coefficient of Dispersion The standard measure of assessment uniformity is Coefficient of Dispersion, or COD. Even with that reversal, property tax uniformity has tended to improve over the last 32 years. 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