rats {chandwich} | R Documentation |

## Rat tumor data

### Description

Tumor incidence in 71 groups of rate from Tarone (1982).
The matrix `rat`

has 71 rows and 2 columns.
Each row relates to a different group of rats.
The first column (`y`

) contains the number of rats with tumors.
The second column (`n`

) contains the total number of rats.

### Usage

```
rats
```

### Format

A matrix with 71 rows and 2 columns.

### Source

Table 5.1 of Gelman, A., Carlin, J. B., Stern, H. S. Dunson, D. B.,
Vehtari, A. and Rubin, D. B. (2013) *Bayesian Data Analysis*,
Chapman & Hall / CRC.
http://www.stat.columbia.edu/~gelman/book/data/rats.asc

### References

Tarone, R. E. (1982) The use of historical information in
testing for a trend in proportions. *Biometrics*, **38**,
215-220.

[Package

*chandwich* version 1.1.5

Index]