Means and SDs () for IIV definitions; these values are the actual sample values from the observed data and were used as “population parameters” for simulations.

NOTE: ISD and CV values involving total scores were based on standardized totals on the two tests (using diagnostic group-specific means and SDs). LIV was obtained as the square root of the squared standardized residuals from the regression of the CV on the total score of the test (or, on both total scores, for the 3rd LIV value)- LIV values were all positive (H. Christensen, personal communication).

注：涉及总分的ISD与变异系数（Coefficient of Variation，CV）数值，均基于两项测试的标准化总分计算所得，计算过程采用了诊断分组特异性均值与标准差（Standard Deviation，SD）。LIV的计算方式为：将CV对测试总分进行回归后得到的标准化残差平方的平方根；若为第3个LIV值，则需同时以两项测试的总分为回归依据。所有LIV数值均为正值（H. Christensen，私人交流）。