Penalized likelihood estimation for semiparametric mixed models, with application to alcohol treatment research

A random effects four-part model, with application to correlated medical costs

(2008) Lei Liu et al.   COMPUTATIONAL STATISTICS & DATA ANALYSIS

A Bayesian analysis for longitudinal semicontinuous data with an application to an acupuncture clinical trial

(2008) Pulak Ghosh et al.   COMPUTATIONAL STATISTICS & DATA ANALYSIS

A multi‐level two‐part random effects model, with application to an alcohol‐dependence study

(2008) Lei Liu et al.   STATISTICS IN MEDICINE

Joint modeling longitudinal semi-continuous data and survival, with application to longitudinal medical cost data

(2008) Lei Liu   STATISTICS IN MEDICINE

A likelihood reformulation method in non‐normal random effects models

(2007) Lei Liu et al.   STATISTICS IN MEDICINE

The use of Gaussian quadrature for estimation in frailty proportional hazards models

(2007) Lei Liu et al.   STATISTICS IN MEDICINE