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Count Regression and Zero-Inflated Models with Extensions to Mixed-Models

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Count Regression and Zero-Inflated Models with Extensions to Mixed-Models

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    1. Count Regression and Zero-Inflated Models with Extensions to Mixed-Models Dave Atkins, PhD Psychiatry and Behavioral Science University of Washington Bob Gallop, PhD Applied Mathematics and Statistics West Chester University

    2. Before we get started A bit about me A bit about statistical pedagogy (or, stats and cars) A bit about you Data analyst Researcher who does some/most of my own stats Researcher and someone else usually does stats Software packages and how-to Related to none of this Clinical Research Methods and Statistics SIG Courtesy of Jason Kilmer: Whats the difference between a statistician and a large pizza?

    3. Overview Count outcomes: 3 different datasets Whats special? Why not OLS regression? Poisson and negative binomial regression Zero-inflated models (ZIP/ZINB) Mixed-effects extensions for clustered and longitudinal data

    4. Does stress negatively influence sexual activity? 116 Swiss university students 12 weeks of daily diaries: Sexual activity 0, 1, 2+ Weekly total Stress Sexual satisfaction

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