hw8key - BIOST/EPI 513 Spring Quarter 2011 Dr. McKnight...

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1 BIOST/EPI 513 Spring Quarter 2011 Dr. McKnight HOMEWORK 8 KEY See Appendix I for STATA commands and Appendix II for output. 1. Use the data from the leukemia clinical trial given in leuk.dta on the Assignments page of the class website to examine the evidence that treatment is related to survival. (a) Plot Kaplan-Meier survival curves for the two treatment groups, with numbers of censored observations indicated, on the same graph. Figure 1. Kaplan-Meier survival curves for the two treatment groups, with numbers of censored observations indicated. (b) Present median survival times and 95% confidence intervals for each of the two groups. Table 1. Median survival times (weeks) and 95% confidence intervals (CI) by group. Group Median 95% CI Placebo 8 (4, 11) 6 MP 23 (13, ∞)
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2 (c) Perform the logrank test for comparing the two treatment groups, and present both test statistic and P-value.
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This note was uploaded on 02/09/2012 for the course STAT 513 taught by Professor Barbaramc.knight during the Spring '11 term at University of Washington.

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hw8key - BIOST/EPI 513 Spring Quarter 2011 Dr. McKnight...

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