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Step-wise logistic regression using SPSS

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An HIV researcher explored the factors that influenced condom use with a new partner (relationship less than 1 month old). The outcome measured was whether a condom was used (Use: condom used =1, used = 0). The predictor variables were mainly scales from the Condom Attitude Scale (CAS) by Sacco, Levine, Reed, and Thompson (1991). Gender; the degree to which the person views their relationship as 'safe' from sexually transmitted disease (Safety); the degree to which previous experience influences attitudes towards condom use (Sexexp); whether or not the couple used a condom in their previous encounter, 1= condom used, 0 = not used, 2 = n previous encounter with this partner (Previous); the degree of self-control that a person has when it comes to condom use (Selfcon); the degree to which the person perceives a risk from unprotected sex (Perceive). Previous research (Sacco, Rickman, Thompson, Levine, & Reed, 1993) has shown that gender, relationship safety and perceived risk predict condom use. Carry out an analysis using Condom.sav to verify these previous findings, and to test whether self-control, previous usage and sexual experience predict condom use.
Can someone help me with completing a SPSS logistic multiple regression analysis for the above exercise using the condom.sav dataset from the Field text. I have to report the findings in APA format according to the guidelines in the PASW Application Assignment Guidelines handout. My SPSS output is attached. I do not know if it is correct. (SEE ATTACHED DATA)

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Solution Summary

This solution is comprised of a detailed explanation of Step-wise Logistic regression analysis. This solution mainly discussed model fit, interpretation of coefficient of logistic regression. Null and alternative hypothesis defined in Hypotheses sections, results is discussed in apa format as well as in simple language, discussion is done in last section of the solution. All the SPSS syntax and output is provided at the end.

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Logistic Multiple Regression Analysis Using SPSS

Thank you for your hard work on this - here is a note from a friend who is working on the same issue - he is referring to the SPSS input:

The correct analysis was to run a hierarchical logistic regression entering perceive, safety and gender in the first block and previous, selfcon and sexexp in a second. I used forced entry on both blocks, but you could choose to run a forward stepwise method on block 2 (either strategy is justified). For the variable previous I used an indicator contrast with 'No condom' as the base category.

While he wouldn't help me further, he did note the following: Therefore, there is a 91% chance that she will use a condom on her next encounter. Hope this helps.

Statistics Application Evaluation Criteria

Use this rubric for the following Applications: Factorial ANOVA (Week 3), ANOVA with Repeated Measures (Week 4), ANCOVA (Week 5), Multiple Regression (Week 6), Linear Multiple Regression (Week 7), Odds Ratio (Week 8), Logistic Regression (Week 9), Cronbach's Alpha (Week 11).

During several weeks of the term, you will be required to run statistics problems using SPSS. The website of the primary textbook author provides answers to most questions to help guide you as you work. However, you will be required to document your work and submit it as a package to your instructor. Please use this document as guidance for submitting your PASW weekly applications. Note that each assignment is worth 50 points; point assignments are indicated next to each indicator.

Create a master MS Word document (you should only be submitting ONE document each week). Label it in accordance with the convention described in your syllabus. Inside of this document, include the following information.
1. (5 pts) State the underlying assumptions for the statistical test.
2. (5 pts) State whether the assumptions have been met. If the assumptions were not met (either in actuality or hypothetically), state what alternatives you have available to you.
3. (5 pts) State the null and alternative (research) hypotheses.
4. (5 pts) Copy your syntax file and paste it into your MS Word Document.
5. (5 pts) For your output file: Select all  Copy all objects  Paste into your MS word document. This will ensure that your output is in a form that your instructor can read.
6. (10 pts) Create a results table consistent with requirements from the APA style manual.
7. (10 pts) Report the results using correct APA format.
a. For ANOVA, ANCOVA, and Repeated Measures ANOVA models, ensure that you provide interpretations for the main effects and interactions as well as any post-hoc tests.
b. For Multiple and Logistic Regression models, ensure that you include appropriate measures of model fit as well as the specific procedure used (e.g., Hierarchical, Enter, Stepwise, Forward, Backward).
8. (5 pts) Describe how you would compute the sample size to achieve 80% power, alpha = .05, and the appropriate effect size.

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