Comparable sales adjustments, Assessment ratios
This paper presents a method for searching for sales or appraisals with extreme values and for trimming without tedious case-by-case searches or rule-of-thumb methods.
Birch, John W. and Sunderman, Mark A.
"Testing for outliers in sales and appraisal data,"
Assessment Journal: Vol. 4
, Article 2.
Available at: https://researchexchange.iaao.org/assessment_journal/vol4/iss4/2