Biostats SPSS Cox Proportional Hazards

Part2

Week 9 Step by Step Application Guide 9.2

Problem 2. Test the assumption of proportionality

a. Use Kaplan-Meier in SPSS. Create a Hazard plot with time = followed, status=stroke, and factor = hypertension. (20 Points) If closed, re-open the Week09_PRACTICE_dataset.sav data set.

Step 1: Go to AnalyzeSurvivalKaplan-Meier

Step 2: Move “time followed in months [followed]”to Time

Move “Had stroke [stroke]” to Status.

Click Define Event.

Step 3: For single value, type 1.

Click Continue.

Step 4: Move “Had hypertension [hypertension]” to Factor.

Click Options.

Step 5: Check Hazard in Plots.Click Continue.

Step 6: Review Output.

b. Interpret the results: Are the baseline hazards proportional and what does this mean in terms of your planned methodology? (10 Points)