• Statistics in medicine · Jan 2000

    Sample size calculation for planning group sequential longitudinal trials.

    • A Liu, J M Boyett, and X Xiong.
    • Biostatistics Unit, Lombardi Cancer Center S112, Georgetown University Medical Center, 3800 Reservoir Road NW, Washington, D.C. 20007, USA. liua1@gunet.georgetown.edu
    • Stat Med. 2000 Jan 30;19(2):205-20.

    AbstractProcedures are developed in this paper for sample size calculations for planning a group sequential longitudinal trial with various correlation structures, using a test statistic based on generalized estimating equations (Lee, Kim and Tsiatis) and group sequential boundaries based on type I error spending functions (Lan and DeMets).Copyright 2000 John Wiley & Sons, Ltd.

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