Question: 4. Suppose the variable SSU in Question 3 is partitioned into three categories denoted as low, medium, and high. a. Revise the model of Question

4. Suppose the variable SSU in Question 3 is partitioned into three categories denoted as low, medium, and high.

a. Revise the model of Question 3 to give the logit form of a logistic model that treats SSU as a nomi- nal variable with three categories (assume no interaction).

b. Using your model of part

a, give an expression for the odds ratio that compares high to low SSU per- sons, controlling for AGE and SEX.

c. Revise your model of part a to allow for effect modification of SSU with AGE and with SEX.

d. Revise your odds ratio of part b to correspond to your model of part c.

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