The DOI matches its Crossref record; 27 of the 27 references it cites were found in a registry or an index.
Tests for Detecting Overdispersion in Poisson Regression Models
Abstract
Poisson regression models are widely used in analyzing count data. This article develops tests for detecting extra-Poisson variation in such situations. The tests can be obtained as score tests against arbitrary mixed Poisson alternatives and are generalizations of tests of Fisher (1950) and Collings and Margolin (1985). Accurate approximations for computing significance levels are given, and the power of the tests against negative binomial alternatives is compared with those of the Pearson and deviance statistics. One way to test for extra-Poisson variation is to fit models that parametrically incorporate and then test for the absence of such variation within the models; for example, negative binomial models can be used in this way (Cameron and Trivedi 1986; Lawless 1987a). The tests in this article require only the Poisson model to be fitted. Two test statistics are developed that are motivated partly by a desire to have good distributional approximations for computing significance levels. Simulations suggest that one of the statistics should be satisfactory for testing extra-Poisson variation in most practical situations involving Poisson regression models.
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Econometric models based on count data. Comparisons and applications of some estimators and tests
Cameron, A. C., & Trivedi, P. K. (1986) · Journal of Applied Econometrics · doi:10.1002/jae.3950010104 · Cited by 1,771
Negative binomial and mixed Poisson regression
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Self-citationExtra-Poisson Variation in Log-Linear Models
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Cited by
Regression-based tests for overdispersion in the Poisson model
Cameron, A. C., & Trivedi, P. K. (1990) · Journal of Econometrics · doi:10.1016/0304-4076(90)90014-k · Cited by 1,192
Metadata
- Authors
- Dean, C., & Lawless, J. F.
- Venue
- Journal of the American Statistical Association
- Publisher
- Informa UK Limited
- Published
- 1989-06
- Volume
- 84
- Issue
- 406
- Pages
- 467-472
- ISSN
- 0162-1459 (ISSN-L)
- 1537-274X
- OpenAlex
- W2007719232
- Cited by
- 342
- References
- 27
- FWCI
- 8.73
- Type
- journal article
- Language
- en
- Open access
- closed
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