Computed sample size, estimated expected width, and simulated expected width for 95% confidence interval of standardized contrast when the number of groups G = 3, standardized contrast effect ψ* = 0.5, and covariate disparity θ = 0.25.

Computed sample size, estimated expected width, and simulated expected width for 95% confidence interval of standardized contrast when the number of groups G = 3, standardized contrast effect ψ* = 0.5, and covariate disparity θ = 0.25.当组数G=3、标准化对比效应ψ*=0.5且协变量差异θ=0.25时，标准化对比（standardized contrast）的95%置信区间（95% confidence interval）对应的计算所得样本量、估计期望宽度与模拟期望宽度