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10 <br /> Performance Standards <br /> How do we know what is correct and what needs review? <br /> Price-Related Differential (PRD) is used to identify categories outside of <br /> accepted standards when reviewing vertical equity. <br /> PRD is a statistical measure used to assess the equity of property <br /> appraisals, specifically examining whether higher-value properties are <br /> assessed at the same ratio to market value as lower-value properties. It <br /> helps determine if the appraisal process is biased towards or against <br /> certain property values. <br /> PRD does not identify an issue, but points to the possibility of an issue. <br /> ORANGE COUNTY <br /> 8 NORTH CAROLINA <br />