Problem 4 Data were collected to study a type of damage caused by waves to the forward section of certain cargo-carrying vessels. The values of the following variables were recorded: . type: ship type (coded as A to E); . year: year of construction (1960, 1965, 1970, 1975); . period: period of operation (1960-74, 75-79); . service: aggregate months of service . incidents: number of damage incidents Call : glm (formula = incidents ~ offset (log(service) ) + type + year + period, family=poisson, data=wdships) Deviance Residuals: Min 10 Median 3Q Max -1. 6768 -0.8293 -0.4370 0.5058 2.7912 Coefficients: Estimate Std. Error z value Pr(> |z1) (Intercept) -6.40590 0. 21744 -29. 460