Li N., Elashoff DA, Robbins WA, Xun L.A hierarchical zero-inflated log-normal model for skewed responses. Statistical Methods in Medical Research first published on Sept. 24, 2008 as doi:10.1177/0962280208097372.
2.
Liu L., Ma JZ, Johnson B.A multi-level two-part random effects model, with application to an alcohol dependence study. Statistics in Medicine2008 ; 27: 3528-39.
