A tutorial on count regression and zero-altered count models for longitudinal substance use data
Psychology of Addictive Behaviors (2013) - Comment
pubmed: 22905895  doi: 10.1037/a0029508  issn: 1939-1501  issn: 0893-164x 

David C. Atkins, Scott A. Baldwin, Cheng Zheng, Robert J. Gallop, Clayton Neighbors