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. Author manuscript; available in PMC: 2015 Dec 28.
Published in final edited form as: Am J Drug Alcohol Abuse. 2015 Jul 8;41(6):489–497. doi: 10.3109/00952990.2015.1056447

Table 2.

Model Selection Based on AIC Criterion

Cannabis Cigarettes Alcohol Opioids
AIC (smaller is better) Negative Binomial 2448.8 2768.2 1647.3 565.1
Beta Binomial 2329.1 2078.5 1664.1 564.8
Zero-Inflated Negative Binomial 2412.6 2650.0 * 545.9
Zero-Inflated Beta-Binomial 2328.4 2077.1 * 559.8

Models with AIC values within 2 units of the lowest AIC are evaluated further for model selection

*

Excluded models