Question

An investigator studied the effects of three different antidepressants (A, B, and C) on patient ratings of depression. To do this, patients were stratified into six age– gender combinations. From a random sample of three patients from each stratum, the experimenter randomly allocated the three antidepressants. On the day the study was to be initiated, a baseline (pretreatment) depression scale rating was obtained from each patient. The assigned therapy was then administered and maintained for 1 week. At that time, a second rating (posttreatment) was obtained from each patient. The pre- and posttreatment ratings appear next (a higher score indicates more depression).
a. Identify the experimental design.
b. Write a first- order model relating the posttreatment response y to the pretreat-ment rating x1 for each treatment.


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  • CreatedNovember 21, 2015
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