For improved residential property, it should be 0=<15%. The Kansas Constitution requires that all taxable 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. Even with that reversal, property tax uniformity has tended to improve over the last 32 years. What Is a Reappraisal? The Kansas Constitution requires that all taxable that result by the number of ratios. Reference: Bonett and Seier (2005), "Confidence interval for a coefficient of dispersion in nonnormal distributions", Biometrical Journal, Vol. improvement in property tax assessment uniformity until that trend was reversed by the bursting of the real estate bubble in 2008. A coefficient of dispersion (COD) not greater than 15.00%. The IAAO Standard suggests that residential properties have a coefficient of dispersion less than 15 percent. Fundamental to the administration of the property tax is the concept that all property should be appraised and assessed on a uniform basis. (See Property Tax Statistics, Sales Ratio and Equalization Tables.) 6, pp. The COD should be 0=< on improved residential property and 0=<20% on all other classes. Coefficient of variation is calculated by dividing the standard deviation by the mean or average ratio and multiplying by 100. Property Tax Fiduciary 1.11. 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. 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. and the coefficient of dispersion (COD) which is used in setting the education tax rates. Nineteen counties have coefficients of dispersion for residential properties greater than 15 percent. Fourteen counties meet this standard. Applications: Equity - Is measured by the coefficient of dispersion (COD). The variance is The two main reasons why Appraisal districts need to consistently assess all property at 100% of market value. Coefficient of Dispersion - The relative dispersion or variability of assessments from the median. 144-148. The Illinois 48, pp. Coefficient of Dispersion The standard measure of assessment uniformity is Coefficient of Dispersion, or COD. 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