View source: R/overdispreg.test.R

Score test for overdispersion in Poisson regression | R Documentation |

Score test for overdispersion in Poisson regression.

```
overdispreg.test(y, x)
```

`y` |
A vector with count data. |

`x` |
A numerical matrix with predictor variables. |

A score test for overdispersion in Poisson regression is implemented.

A vector with two values. The test statistic and its associated p-value.

Michail Tsagris.

R implementation and documentation: Michail Tsagris mtsagris@uoc.gr.

Yang Z., Hardin J.W. and Addy C.L. (2009). A score test for overdierpsdion in Poisson regression based on the generalised Poisson-2 model. Journal of Statistical Planning and Inference, 139(4): 1514–1521.

` ztp.reg, censpois.mle wald.poisrat`

```
y <- rnbinom(100, 10, 0.4)
x <- rnorm(100)
overdispreg.test(y, x)
```

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