Sensitivity of test for overdispersion in Poisson regression
Overdispersion or extra-Poisson variation is very common for count data. This phenomenon arises when the variability of the counts greatly exceeds the mean under the Poisson assumption, resulting in substantial bias for the parameter estimates. To detect whether count data are overdispersed in the P...
| Main Authors: | , |
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| Format: | Journal Article |
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Wiley-VCH
2005
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| Online Access: | http://hdl.handle.net/20.500.11937/42652 |