Helmert方差估计
Helmert variance estimation
IBD方差组分随机模型
IBD-Based variance component random model
背景场误差协方差
Background error covariance
背景误差协方差
back error covariance
Background error covariance
被试者间方差
betweensubjects variance
边缘互方差
edge correlation deviation
不确定噪声方差
Uncertain noise covariance