# ex9 - 67.1 Somers D 0.350 Percent Discordant 32.1 Gamma...

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The Goal of this multiple logistic regression is to predict whether a patient has coronary heart  disease based on smoking status (1 if they smoke), age in years, and cholesterol (continuous). The SAS System 11:35 Tuesday, June 10, 2008 2 The LOGISTIC Procedure Testing Global Null Hypothesis: BETA=0 Test Chi-Square DF Pr > ChiSq Likelihood Ratio 25.3854 3 <.0001 Score 25.3949 3 <.0001 Wald 23.9666 3 <.0001 Type 3 Analysis of Effects Wald Effect DF Chi-Square Pr > ChiSq AGE 1 14.3361 0.0002 CHL 1 5.5492 0.0185 SMK 1 7.9966 0.0047 Analysis of Maximum Likelihood Estimates Standard Wald Parameter DF Estimate Error Chi-Square Pr > ChiSq Intercept 1 -7.0277 1.1067 40.3243 <.0001 AGE 1 0.0511 0.0135 14.3361 0.0002 CHL 1 0.00737 0.00313 5.5492 0.0185 SMK 1 1 0.8512 0.3010 7.9966 0.0047 Odds Ratio Estimates Point 95% Wald Effect Estimate Confidence Limits AGE 1.052 1.025 1.081 CHL 1.007 1.001 1.014 SMK 1 vs 0 2.342 1.299 4.225 Association of Predicted Probabilities and Observed Responses Percent Concordant

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Unformatted text preview: 67.1 Somers' D 0.350 Percent Discordant 32.1 Gamma 0.353 Percent Tied 0.8 Tau-a 0.072 Pairs 38198 c 0.675 Questions: a) Interpret the Odds Ratio of SMK 1 vs. 0 (which is 2.342). b) Interpret the odds ratio of CHL (which is 1.007). c) Give a 95% Confidence Interval for the effect of a 20 point increase in CHL. d) What are the odds a 55 year old smoker with a cholesterol of 210 has CHD? e) What is the probability this same person has CHD? f) Find the odds ratio for a person who is 60 years old, has a cholesterol of 210 and doesn’t smoke having CHD as opposed to a 55 year old person with a cholesterol of 190 and doesn’t smoke. g) Find the odds ratio for a person who is 55 years old, has a cholesterol of 225 and does smoke having CHD versus a person who is 65, has a cholesterol of 225 and does not smoke....
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## This note was uploaded on 07/25/2008 for the course STT 422 taught by Professor Porter during the Summer '08 term at Michigan State University.

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ex9 - 67.1 Somers D 0.350 Percent Discordant 32.1 Gamma...

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