Estimating correlation between multivariate longitudinal data in the presence of heterogeneity.
Feng GaoJ Philip MillerChengjie XiongJingqin LuoJulia A BeiserLing ChenMae O GordonPublished in: BMC medical research methodology (2017)
Conditional correlation given random effects provides a robust estimate to describe the correlation between multivariate longitudinal data in the presence of unobserved heterogeneity (NCT00000125).