Logistic Regression: A Self-learning Text, Third Edition (Statistics in the Health Sciences)

Impact of misspecification (usually) OR Sb For Models 1–5: dOR range¼ 1 : 25  3 : 39 dOR range suggests model instability. Inst ...

III. Example 2: Aspirin–Heart Bypass Study Data source: Gavaghan et al., 1991 Subjects: 214 patients received up to 6 coronary b ...

Exchangeablecorrelation structure Variable Coefficient Empirical Std Err Wald p- value INTERCEPT 1.1583 2.3950 0.6286 ASPIRIN 0 ...

Two tests:  Score test  Generalized Wald test Under H 0 , both test statistics approximatew^2 with df¼#of parameters tested. C ...

Odds ratio ORdASPIRIN¼ 1 vs:ASPIRIN¼ 0 ¼expð 1 : 3302 Þ ¼ 0 : 264 Wald test H 0 :b 1 ¼ 0 Z¼  1 : 3302 0 : 1444 ¼ 9 : 21 ;P¼ 0 ...

Comparison of model results for ASPIRIN Correlation structure Odds ratio 95% CI Exchangeable (GEE) 0.26 (0.20, 0.35) Independent ...

Model 1 logit PðD¼ 1 jXÞ¼b 0 þb 1 RX ni¼ 2 :½AR 1 ;exchangeable; or unstructuredŠ )same 2  2 Ci Ci¼ 1 r r 1 " Exchangeablecorre ...

Chapter 16: Other Approaches to Analysis of Correlated Data These examples illustrate the GEE approach for modeling data contain ...

Detailed Outline I. Overview (page 542) II–IV. Examples (pages 542–557) A. Three examples were presented in detail: i. Infant Ca ...

Practice Exercises The following printout summarizes the computer output from a GEE model run on the Infant Care Study data and ...

Explain the underlying assumptions of a stationary 4-dependent correlation structure as it pertains to the Infant Care Study. E ...

How can the unstructured correlation structure be used to assess assumptions underlying other more constrained correlation stru ...

Test Questions 1–6 refer to models run on the data from the Heartburn Relief Study (discussed in Sect. IV). In that study, 40 su ...

Model 2 Variable Coefficient Empirical Std Err INTERCEPT 0.5625 0.4058 RX 0.3104 0.3992 SEQUENCE 0.7118 0.5060 Model 3 Variable ...

Answers to Practice Exercises The stationary 4-dependent working correlation struc- ture uses four correlation parameters (a 1 ...

correlations are all similar, this would suggest that an exchangeable structure is reasonable. Estimated OR¼exp(0.3601)¼1.43. 9 ...

16 Other Approaches for Analysis of Correlated Data n Contents Introduction 568 Abbreviated Outline 568 Objectives Presentation ...

Introduction In this chapter, the discussion of methods to analyze out- come variables that have dichotomous correlated res- pon ...

Objectives Upon completing this chapter, the learner should be able to: Contrast the ALR method to GEE with respect to how with ...

Presentation I. Overview Other approaches to modeling outcomes with dichotomous correlated responses FOCUS Other approaches for ...