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PVD: counties may use external statistical tools; PVD used all sales in latest study
Summary
PVD told Sedgwick County commissioners it used all sales in the most recent ratio study and said counties often employ external statistical packages (SPSS or similar) for advanced modeling; PVD provides templates and the statewide CAMS/GRAMA tools.
Commissioners asked whether Sedgwick County (the state's second-largest county by population) might be missing statistical tools or support that PVD could provide.
Bob Ken said PVD does not supply advanced regression packages such as SPSS to counties; PVD provides templates and the statewide CAMS/GRAMA system for storing and processing valuation data, and larger counties may supplement with external statistical packages and in-house statisticians.
Ken also said PVD used all sales in the most recent preliminary study. "We did use all sales last year," he told commissioners while discussing the sampling versus full-review debate; PVD staff said the agency is still discussing whether to continue full-review or return to a sampling process in future studies.
Commissioners asked the county appraiser to confirm Sedgwick's use of time trends and analytic methods offline; the county appraiser said he had requested a time-trend adjustment that improved Sedgwick's confidence intervals for commercial values.
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