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Contemporary Clinical Trials|May 4, 2012
Sample size calculation for time-averaged differences in the presence of missing dataSong Zhang, Chul AhnComputational Statistics & Data Analysis|November 28, 2012
Sample Size Calculation for Comparing Time-Averaged Responses in K-Group Repeated-Measurement StudiesSong Zhang, Chul AhnContemporary Clinical Trials|January 19, 2011
How many measurements for time-averaged differences in repeated measurement studies?Song Zhang, Chul AhnStatistics in Biopharmaceutical Research|July 20, 2011
Adding Subjects or Adding Measurements in Repeated Measurement Studies Under Financial ConstraintsSong Zhang, Chul AhnPharmaceutical Statistics|December 5, 2008
Effects of correlation and missing data on sample size estimation in longitudinal clinical trialsSong Zhang, Chul AhnContemporary Clinical Trials|September 30, 2015
Sample size calculation for before-after experiments with partially overlapping cohortsSong Zhang, Jing Cao, Chul AhnCommunications in Statistics: Theory and Methods|September 10, 2025
Sample size estimation for the ratio of count outcomes in a cluster randomized trial using GEEJijia Wang, Song Zhang, Chul AhnCommunications in Statistics: Theory and Methods|November 27, 2019
Sample Size Calculation for Count Outcomes in Cluster Randomization Trials with Varying Cluster SizesJijia Wang, Song Zhang, Chul AhnComputational Statistics & Data Analysis|December 3, 2013
A GEE Approach to Determine Sample Size for Pre- and Post-Intervention Experiments with DropoutSong Zhang, Jing Cao, Chul AhnStatistical Methods in Medical Research|August 26, 2015
Sample size considerations for split-mouth designHong Zhu, Song Zhang, Chul AhnPageof 331