A team of physicians, psychiatrists, and psychologists investigated whether depressed patients exhibit more or fewer personality disorder
Question:
a. Write a model for E(y) as a function of the qualitative variable, patient diagnosis group.
b. If there are no differences among the mean number of personality disorders for the three patient groups, what are the values of the b's in the model, part a?
c. How could you test to determine if the mean number of personality disorders for the major depression-only patients is less than the corresponding mean for the patients with both major depression and personality disorder?
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