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662 CHAPTER 12 THE CHI-SQUARE DISTRIBUTION AND THE ANALYSIS OF FREQUENCIES
Total Total Total
Duration of Duration of Duration of
Remission Remission Remission Remission Remission Remission
(Months) Status a (Months) Status a (Months) Status a
3 1 8 2 26 1
3 2 9 2 27 1
3 1 10 1 28 2
3 1 10 1 29 1
3 1 11 2 31 2
4 1 13 1 31 1
4 1 16 1 33 2
4 1 16 2 39 2
5 1 17 2 41 1
5 1 18 2 44 1
5 1 20 1 46 1
5 1 22 1 46 2
5 1 22 2 48 1
5 1 22 2 48 2
5 1 23 1 48 1
6 1 24 2 49 1
6 1 25 2 50 1
6 1 25 2 53 1
7 1 26 1 70 2
8 2 26 1 94 1
8 1
8 2
a 1 yes (the patient is still in remission); 2 no (the patient has relapsed).
Source: Dr. Mary Ann Banerji. Used with permission.
12.8.3 If available in your library, read the article, “Impact of Obesity on Allogeneic Stem Cell Transplant
Patients: A Matched Case-Controlled Study,” by Donald R. Fleming et al. [American Journal of
Medicine, 102 (1997), 265–268] and answer the following questions:
(a) How was survival time determined
(b) Why do you think the authors used the Wilcoxon test (Breslow test) for comparing the survival
curves
(c) Explain the meaning of the p values reported for Figures 1 through 4.
(d) What specific statistical results allow the authors to arrive at their stated conclusion
12.8.4 If available in your library, read the article, “Improved Survival in Patients with Locally Advanced
Prostate Cancer Treated with Radiotherapy and Goserelin,” by Michel Bolla et al. [New England
Journal of Medicine, 337 (1997), 295–300], and answer the following questions:
(a) How was survival time determined
(b) Why do you think the authors used the log-rank test for comparing the survival curves