Assessment Journal


Assessment performance measures, Assessment sales ratio studies


The IAAO Standard on Ratio Studies (1999) states that jurisdictions should not be managed to reappraise unless the ratio indicates failure to meet uniformity standards with an appropriate degree of statistical confidence. This implies that one must calculate confidence intervals about the calculated COD or conduct related tests to determine whether required standards have been met. Unfortunately, there are no published formulas for calculating confidence intervals for the COD, and the only method cited in eh appraisal literature for doing so is the complex, computer-intensive bootstrap method. This paper evaluates the dilemma and proposes a simple, realistic test for determining whether COD standards have been achieved.

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