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A simple method of sample size calculation for unequal‐sample‐size designs that use the logrank or t ‐test
Author(s) -
Hsieh F. Y.
Publication year - 1987
Publication title -
statistics in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.996
H-Index - 183
eISSN - 1097-0258
pISSN - 0277-6715
DOI - 10.1002/sim.4780060506
Subject(s) - sample size determination , simple (philosophy) , monte carlo method , statistics , log rank test , sample (material) , computer science , rank (graph theory) , mathematics , survival analysis , chromatography , philosophy , chemistry , epistemology , combinatorics
This paper presents a simple method of calculating sample sizes for unequal‐sample‐size designs with use of published tables applicable to equal‐sample‐size designs. The method applies to both the logrank test and the t ‐test. For the power of logrank test, this paper compares the proposed method with existing methods and with the Monte Carlo simulation.