A tutorial on count regression and zero-altered count models for longitudinal substance use data.
A tutorial on count regression and zero-altered count models for longitudinal substance use data.
Critical research questions in the study of addictive behaviors concern how these behaviors change over time: either as the result of intervention or in naturalistic settings. The combination of count outcomes that are often strongly skewed with many zeroes (e.g., days using, number of total drinks, number of drinking consequences) …