47 citations · 78 across the 2 of their papers we have counts for
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math.ST2009★ 31 cited
A semiparametric model for cluster data
Wenyang Zhang, Jianqing Fan, Yan Sun
In the analysis of cluster data, the regression coefficients are frequently assumed to be the same across all clusters. This hampers the ability to study the varying impacts of fac…
math.ST2008★ 47 cited
Estimation of the covariance matrix of random effects in longitudinal studies
Yan Sun, Wenyang Zhang, Howell Tong
Longitudinal studies are often conducted to explore the cohort and age effects in many scientific areas. The within cluster correlation structure plays a very important role in lon…