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Biometrika 1978 65(3):615-623; doi:10.1093/biomet/65.3.615
© 1978 by Biometrika Trust
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Sequential testing of the equality of two survival distributions using the modified Savage statistic

JAMES A. KOZIOL and A. JOHN PETKAU

Department of Mathematics, University of British Columbia Vancouver

Sequential procedures based on the modified Savage statistic are proposed for testing the equality of two survival distributions when observations are singly censored. Asymptotic properties, including expected sample sizes and power against contiguous exponential scale shift alternatives, are examined. Comparison is made with procedures based on a modified Mantel-Haenszel statistic (Muenz, Green & Byar, 1977).

Key Words: Censoring • Log rank test • Mantel-Haenszel statistic • Progressive testing • Savage statistic • Survival distributions • Wiener process


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