7.8. The data given in data frame Insurance consist of the numbers of policyholders n of an insurance company who were exposed to risk, and the numbers of car insurance claims made by those policyholders in the third quarter of 1973

(Baxter, Coutts & Ross, 1980, Aitkin et al., 1989. The data are cross-classified by District (four levels), Group of car (four levels), and Age of driver (four ordered levels). The other variables in the data frame are the numbers of Holders and Claims.