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15 <br /> Performance Measures — Coefficient of Dispersion <br /> Coefficient of Dispersion is used to measure uniformity in a sales <br /> ratio study. A high COD indicates a large variance between the <br /> highest ratios and the lowest ratios compared to the median . A low <br /> COD represents conformity amongst the county. <br /> COD standards vary by strata, which is the division of properties into <br /> distinct groups or categories for mass appraisal purposes. <br /> • Single-family homes and condominiums (urban and suburban) <br /> • Newer or homogenous market areas: 5.0 to 1 0.0 <br /> • Older or heterogenous market areas: 5.0 to 15.0 <br /> ORANGE COUNTY <br /> 13 NORTH CAROLINA <br />