Garthwaite, Paul H. and Al-Awadhi, Shafeeqah A.
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|DOI (Digital Object Identifier) Link:||http://doi.org/10.1111/1467-9868.00278|
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Elicitation methods are proposed for quantifying expert opinion about a multivariate normal sampling model. The natural conjugate prior family imposes a relationship between the mean vector and the covariance matrix that can portray an expert's opinion poorly. Instead we assume that opinions about the mean and the covariance are independent and suggest innovative forms of question which enable the expert to quantify separately his or her opinion about each of these parameters. Prior opinion about the mean vector is modelled by a multivariate normal distribution and about the covariance matrix by both an inverse Wishart distribution and a generalized inverse-Wishart (GIW) distribution. To construct the latter, results are developed that give insight into the GIW parameters and their interrelationships. Certain of the elicitation methods exploit unconditional assessments as fully as possible, since these can reflect an expert's beliefs more accurately than conditional assessments. Methods are illustrated through an example.
|Item Type:||Journal Article|
|Keywords:||Assessment tasks; Elicitation; Generalized inverse Wishart distribution; Non-conjugate distribution; Prior distribution; Subjective probability|
|Academic Unit/Department:||Faculty of Science, Technology, Engineering and Mathematics (STEM) > Mathematics and Statistics
Faculty of Science, Technology, Engineering and Mathematics (STEM)
|Depositing User:||Users 2598 not found.|
|Date Deposited:||27 Jun 2006|
|Last Modified:||02 Aug 2016 12:55|
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