hw8.ass - Page 1 of 3 Stat209/Ed260 D Rogosa Assignment 8...

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Stat209/Ed260 D Rogosa 2/26/09 Assignment 8. Matching and propensity score methods cf Lab 4 for aditional matching exercises Problem 1. Matching to increase precision: Randomized blocks designs From Neter-Wasserman problem DENTAL PAIN. An anesthesiologist made a comparative study of the effects of acupuncture and codiene on postoperative dental pain in male subjects. The four treatments were (1) placebo treatment-- a sugar capsule and two inactive acupuncture points, (2) codiene treatment only--a codeine capsule and two inactive acupuncture points; (3) acupucture only--a sugar capsule and two active acupuncture points (4) both codeine and acupuncture. These 4 conditions have a 2x2 factorial structure. Thirty-two subjects were grouped into 8 blocks of four according to an initial evaluation of their level of pain tolerance. The subjects in each block were then randomly assigned to the 4 treatments. Pain relief scores were obtained 2 hours after dental treatment. Data were collected on a double-blind basis. Data in file http://www-stat.stanford.edu/~rag/stat209/dental.dat c1 is pain relief score (higher means more pain relief), c2 is block c3 is codiene c4 is acupuncture--for c3 and c4, 1=no.
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