In a study of violent victimization of women and men, Porcerelli et al. (A-11) c

Question

In a study of violent victimization of women and men, Porcerelli et al. (A-11) collected information from 679 women and 345 men ages 18 to 64 years at several family-practice centers in the metropolitan Detroit area. Patients filled out a health history questionnaire that included a question about victimization. The following table shows the sample subjects cross-classified by gender and whether the subject self-identified as being "hit, kicked, punched, or otherwise hurt by someone within the past year." Subjects answering yes to that question are classified "violently victimized." Use logistic regression analysis to find the regression coefficients and the estimate of the odds ratio. Write an interpretation of your results. Source: John H. Porcerelli. Rosemary Cogan, Patricia P. West, Edward A. Rose, Dawn Hambrecht, Karen E. Wilson, Richard K. Severson, and Dunia Karana, "Violent Victimization of Women and Men: Physical and Psychiatric Symptoms, " Journal of the American Board of Family Practice, 16 (2003), 32-39.

Explanation / Answer

In a study of violent victimization of women and men, 679 women and 345 men were surveyed and reported whether they had been hit kicked or punched or otherwise hurt by someone within the past year. Subjects who answered yes where classified as violently victimized. Use logistic regression analysis to find the regression coefficients and the estimate of the odds ratio. Write an interpretation of your results.

Victimization Women Men Total

No victimization 611 308 919

Violently victimized 68 37 105

Total 679 345 1024

SPSS is used and gender is coded as female =1 and male as 0

Model Summary

Step

-2 Log likelihood

Cox & Snell R Square

Nagelkerke R Square

1

676.998a

.000

.000

a. Estimation terminated at iteration number 5 because parameter estimates changed by less than .001.

Variables in the Equation

B

S.E.

Wald

df

Sig.

Exp(B)

95% C.I.for EXP(B)

Lower

Upper

Step 1a

gender(1)

.076

.216

.125

1

.723

1.079

.707

1.648

Constant

-2.196

.128

294.973

1

.000

.111

a. Variable(s) entered on step 1: gender.

Logistic Regression coefficient for female = 0.076

Odds ratio = 1.079

If the victim is women, then classified as violently victimized is 7.9% more for women than men.

Model Summary

Step

-2 Log likelihood

Cox & Snell R Square

Nagelkerke R Square

1

676.998a

.000

.000

a. Estimation terminated at iteration number 5 because parameter estimates changed by less than .001.

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