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Table 9.19 is based on a study with British doctors. a. For each age, find the sample coronary death rates per 1000 person-years for nonsmokers and smokers. To compare them, take their ratio and...

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Table 9.19 is based on a study with British doctors.

a. For each age, find the sample coronary death rates per 1000 person-years for nonsmokers and smokers. To compare them, take their ratio and describe its dependence on age.

b. Fit a main-effects model for the log rates having four parameters for age and one for smoking. In discussing lack of fit, show that this model assumes a constant ratio of nonsmokers’ to smokers’ coronary death rates over age.

c. From part (a), explain why it is sensible to add a quantitative interaction of age and smoking. For this model, show that the log ratio of coronary death rates changes linearly with age. Assign scores to age, fit the model, and interpret.

TABLE 9.19 Data for Problem

 Person-Years Coronary Deaths Age Nonsmokers Smokers Nonsmokers Smokers 35-44 18,793 52,407 2 32 45-54 10,673 43,248 12 104 55-64 5710 28,612 28 206 65-74 2585 12,663 28 186 75-84 1462 5317 31 102
Answered Same DayDec 29, 2021

Solution

David answered on Dec 29 2021
SOLUTION.PDF