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

Test Answers

Chapter 1 True-False Questions:

1. F: any type of independent variable is allowed


2. F: dependent variable must be dichotomous


3. T


4. F: S-shaped


5. T


6. T


7. F: cannot estimate risk using case-control study


8. T


9. F: constant term can be estimated in follow-up study


10. T


11. T


12. F: logit gives log odds, not log odds ratio


13. T


14. F:bicontrols for other variables in the model


15. T


16. F: multiplicative


17. F: exp(b) wherebis coefficient of exposure


18. F: OR for effect of SMK is exponential of coefficient of SMK


19. F: OR requires formula involving interaction terms


20. F: OR requires formula that considers coding
    different from (0, 1)


21. e. exp(b) is not appropriate forany X.


22. PðXÞ¼ 1 =ð 1 þexpf½aþb 1 ðAGEÞþb 2 ðSMKÞ
    þb 3 ðSEXÞþb 4 ðCHOLÞþb 5 ðOCCފgÞ:


23. P^ðXÞ¼ 1 =ð 1 þexpf½ 4 : 32 þ 0 : 0274 ðAGEÞ
    þ 0 : 5859 ðSMKÞþ 1 : 1523 ðSEXÞ
    þ 0 : 0087 ðCHOLÞ 0 : 5309 ðOCCފgÞ:


24. logit PðXÞ¼ 4 : 32 þ 0 : 0274 ðAGEÞ
    þ 0 : 5859 ðSMKÞþ 1 : 1523 ðSEXÞ
    þ 0 : 0087 ðCHOLÞ 0 : 5309 ðOCCÞ:
    667