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Double Exponential Families and Their Use in Generalized Linear Regression
Abstract
In one-parameter exponential families such as the binomial and Poisson, the variance is a function of the mean. Double exponential families allow the introduction of a second parameter that controls variance independently of the mean. Double families are used as constituent distributions in generalized linear regressions, in which both means and variances are allowed to depend on observed covariates. The theory is applied to two examples—a logistic regression and a large two-way contingency table. In such cases the binomial model of variance is often untrustworthy. For example, because genuine random sampling was infeasible, the subjects may have been obtained in clumps so that the statistician should really be using smaller sample sizes. Clumped sampling is just one of many possible causes of overdispersion, a habitual source of concern to users of binomial and Poisson models. This article concerns a class of regression families that allow the statistician to model overdispersion while carrying out the usual regression analyses for the mean as a function of the predictors. Close connections with previous ideas concerning generalized linear models are discussed.
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Metadata
- Authors
- Efron, B.
- Venue
- Journal of the American Statistical Association
- Publisher
- Informa UK Limited
- Published
- 1986-09
- Volume
- 81
- Issue
- 395
- Pages
- 709-721
- ISSN
- 0162-1459 (ISSN-L)
- 1537-274X
- OpenAlex
- W2067224571
- Cited by
- 451
- References
- 13
- FWCI
- 10.78
- Type
- journal article
- Language
- en
- Open access
- closed
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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
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