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

VIII. Numerical Example EVANS COUNTY, GA n¼ 609 Note that the example described earlier involv- ing Model 3 is a special case of ...

The first set of results described by the printout information considers a model – called Model A – with no interaction terms. T ...

To carry out thelikelihood ratio test, we would need to compare two models. The full model is Model A as described by the first ...

The Wald test we have just described tests the null hypothesis that the coefficient of the CAT variable is 0 in the model contai ...

Note that the no interaction model we have been focusing on may, in fact, be inappropriate when we compare it to other models of ...

Confidence intervals: exp ^lZ 1 a 2 ffiffiffiffiffiffiffiffiffiffiffiffiffi dvarð^lÞ q where ^l¼^bþ~ p 2 j¼ 1 ^djWj Plugging ...

For the specific interaction model (B) we have been considering, the variance of^lis given by the formula shown here. In computi ...

Chapter 6: Modeling Strategy Guidelines All confidence intervals are quite wide, indicat- ing that their corresponding point est ...

Detailed Outline I. Overview(page 132) Focus:  Testing hypotheses  Computing confidence intervals II. Information for making s ...

V. The Wald test(pages 138–140) A. Requires one parameter only to be tested, e.g., H 0 :b 3 ¼0. B. Test statistic:Z¼^b=s^bwhich ...

C. 100(1a)% CI formula for OR usingE, V, W model: exp^lZ 1 a 2 ffiffiffiffiffiffiffiffiffiffiffiffiffiffi dvar^l  Þ q ; wh ...

Variable Abbreviation Coding Type of hospital HT 1 ¼public, 0¼private Size of hospital HS 1 ¼large, 0¼small Degree of contaminat ...

(Note. In answering all of the above questions, make sure to state your answers in terms of the coefficients and vari- ables tha ...

Using the printout for Model I, compute the point estimate and a 95% confidence interval for the odds ratio for the effect of C ...

Variable Abbreviation Coding Smoking status SMK 1 ¼ever, 0¼never Number of sexual partners NS 1 ¼ 4 þ,0¼0–3 Age at first interco ...

terms of an odds ratio parameter, give the formula for the test statistic, state the distribution of the test sta- tistic under ...

Answers to Practice Exercises logit P(X)¼aþb 1 HTþb 2 HSþb 3 CTþb 4 AGE þb 5 SEX. logit P(X)¼aþb 1 HTþb 2 HSþb 3 CTþb 4 AGE þb ...

wheredvarð^b 1 Þis obtained from the variance–covar- iance matrix or, alternatively, by squaring the value of the standard error ...

Test computation:Z= 0 : 0683 = 0 : 0143 ¼ 4 : 77 ; alterna- tively,Z^2 ¼22.75; the two-tailedP-value is 0.0000, which is very si ...

6 Modeling Strategy Guidelines n Contents Introduction 166 Abbreviated Outline 166 Objectives Presentation 168 Detailed Outline ...