title: Sample size determination for the confidence interval of linear contrast in analysis of covariance.
abstract: This article provides a way to determine sample size for the confidence interval of the linear contrast of treatment means in analysis of covariance (ANCOVA) without prior knowledge of the actual covariate means and covariate sum of squares, which are modeled as a t statistic. Using the t statistic, one can calculate the appropriate sample size to achieve the desired probability of obtaining a specified width in the confidence interval of the covariate-adjusted linear contrast.
authors: Department of Educational Studies, University of South Carolina, Columbia, South Carolina, USA. xliu@mailbox.sc.edu
authors: Xiaofeng Steven
authors: XS
authors: Liu
mesh_terms: D016001:Confidence Intervals; D006801:Humans; D011336:Probability; D018401:Sample Size