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12 <br /> 1 Slide #14 <br /> Performance Measures — Price-Related Differential <br /> (PRD) <br /> PRD = Mean Ratio divided by Weighted Mean Ratio <br /> •.• Mean Ratio = sum of appraised values divided by number of appraised <br /> values <br /> ❖ Weighted Mean Ratio = sum of appraised values less sum of sales prices <br /> IAA0 Standard Acceptable range: 0.98- 1 .03 <br /> Results of PRD: <br /> r A PRD above 1.03: appraisal process may be regressive, meaning higher- <br /> valued properties are undervalued compared to lower-valued properties, <br /> A PRD below 0.98 appraisal process may be progressive, indicating that <br /> higher-valued properties are assessed at a higher rate than lower-valued <br /> properties. <br /> ,a ORAINGE CTH OUNATY <br /> 2 <br /> 3 <br /> 4 Slide #15 <br /> Price-Related Differential (PRD) - Equitable <br /> PRD = 1.000 — Equitable Pattern (Within Standard) <br /> x --- Ideal Rado v 1.00 <br /> 1.190 <br /> 1.075 x <br /> 1.050 x <br /> o x <br /> x <br /> 1.025 x x <br /> x <br /> uci x x x <br /> N1.000 -------------------------------M-x------x---- x---------------- <br /> 44 x x x x <br /> 0.975 <br /> x x x x <br /> x x <br /> 0.950 - <br /> 0.925 <br /> .950 0.925 <br /> $100.000 $250.000 $400.,000 $550,000 $700',000 5850:000 51.004,000 <br /> Sale Prig <br /> ORANGE COUNTY <br /> 15 NC)rt°r'I1 CAROLINA <br /> 5 <br /> 6 <br /> 7 <br />