Valuation accuracy and variation: a meta analysis
This paper provides a first order approximation of the accuracy of commercial property valuations for comparison with the ±5-10% threshold of tradition, convention and judicial acceptance. The nature of ranges is considered in relation to the uniform and normal probability density functions and the...
| Main Authors: | , , |
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| Other Authors: | |
| Format: | Conference Paper |
| Published: |
Press
2007
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| Online Access: | http://hdl.handle.net/20.500.11937/42189 |
| _version_ | 1848756351439732736 |
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| author | Armitage, L. Irons, Janine Skitmore, M. |
| author2 | Committee for the 13 Annual Pacific Real Estate Society Conference |
| author_facet | Committee for the 13 Annual Pacific Real Estate Society Conference Armitage, L. Irons, Janine Skitmore, M. |
| author_sort | Armitage, L. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | This paper provides a first order approximation of the accuracy of commercial property valuations for comparison with the ±5-10% threshold of tradition, convention and judicial acceptance. The nature of ranges is considered in relation to the uniform and normal probability density functions and the effects of bias considered. Summary statistics are examined for gross differences (differences between property valuations and subsequently realised transaction prices) recorded in the Investment Property Databank (IPD) database and significant yearly changes noted in both the means and standard deviations. A meta analysis of previous work is presented which shows all other results involving gross differences (GDs) to be reasonably consistent with statistics yielded by the IPD database. The results for the two main studies of net differences (GDs adjusted for the lag in time between valuation and transaction dates) also suggest yearly trends of a similar nature to the GDs. The role of intravaluer variability is also examined. The variability associated with the time lag is then estimated and applied to the IPD figures to give the approximation sought, suggesting ±5-30% to be a realistic range in place of ±5-10%. |
| first_indexed | 2025-11-14T09:10:49Z |
| format | Conference Paper |
| id | curtin-20.500.11937-42189 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T09:10:49Z |
| publishDate | 2007 |
| publisher | Press |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-421892017-01-30T14:58:00Z Valuation accuracy and variation: a meta analysis Armitage, L. Irons, Janine Skitmore, M. Committee for the 13 Annual Pacific Real Estate Society Conference This paper provides a first order approximation of the accuracy of commercial property valuations for comparison with the ±5-10% threshold of tradition, convention and judicial acceptance. The nature of ranges is considered in relation to the uniform and normal probability density functions and the effects of bias considered. Summary statistics are examined for gross differences (differences between property valuations and subsequently realised transaction prices) recorded in the Investment Property Databank (IPD) database and significant yearly changes noted in both the means and standard deviations. A meta analysis of previous work is presented which shows all other results involving gross differences (GDs) to be reasonably consistent with statistics yielded by the IPD database. The results for the two main studies of net differences (GDs adjusted for the lag in time between valuation and transaction dates) also suggest yearly trends of a similar nature to the GDs. The role of intravaluer variability is also examined. The variability associated with the time lag is then estimated and applied to the IPD figures to give the approximation sought, suggesting ±5-30% to be a realistic range in place of ±5-10%. 2007 Conference Paper http://hdl.handle.net/20.500.11937/42189 Press restricted |
| spellingShingle | Armitage, L. Irons, Janine Skitmore, M. Valuation accuracy and variation: a meta analysis |
| title | Valuation accuracy and variation: a meta analysis |
| title_full | Valuation accuracy and variation: a meta analysis |
| title_fullStr | Valuation accuracy and variation: a meta analysis |
| title_full_unstemmed | Valuation accuracy and variation: a meta analysis |
| title_short | Valuation accuracy and variation: a meta analysis |
| title_sort | valuation accuracy and variation: a meta analysis |
| url | http://hdl.handle.net/20.500.11937/42189 |