Exam II-02

Exam II-02 - Exam II-02 1 Leukimia due to atomic bomb...

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Exam II-02 1. Leukimia due to atomic bomb : Age Survival status Dose (Rad) Not in city 0-9 10-49 50-99 100-199 200+ 0 - 9 LD NLD 10-19 LD NLD 20-34 LD NLD 35-49 LD NLD 50+ LD NLD a) Draw association graphs for each of these models Answer : Model 1 : (A, S, D, AS, AD, SD) D A S
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Model 2 : (A, S, D, AS, AD) S A D Model 3: (A, S, D, AS, AD, AssocSD) D A S Model 4 : (A, S, D, AD, SD) A D S b) For each of these 4 models, specify which variables are conditionally independent. Answer : Model 2 : (A, S, D, AS, AD) S A D Conditionally independent : SD Model 4 : (A, S, D, AD, SD) A D S Conditionally independent : AS c) For each model, specify all the associations that will have the same marginal and partial odds ratios.
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Answer : From Model 2 : S A D and Model 4: A D S AD association is identical in partial and marginal odds ratio. Note : AD association with collapsed of S (in model 2 and 4) has the same conditional and marginal odds ratio. d)
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Exam II-02 - Exam II-02 1 Leukimia due to atomic bomb...

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