Week 8

Poission Regression

Materials for meeting on

March 18, 2023

Before class

Articles

Coxe, S., West, S. G., & Aiken, L. S. (2009). The Analysis of Count Data: A Gentle Introduction to Poisson Regression and Its Alternatives. Journal of Personality Assessment, 91(2), 121–136. https://doi.org/10.1080/00223890802634175
Ryan, W. H., Evers, E. R. K., & Moore, D. A. (2021). Poisson Regressions: A Little Fishy. Collabra: Psychology, 7(1), 27242. https://doi.org/10.1525/collabra.27242

Questions

How does the Poisson distribution differ from other distributions, such as the normal distribution?
How do we interpret the parameters of the poisson?
What are the assumptions of Poisson regression?
What is overdispersion?
How is poisson related to the negative binomial and zero-inflated?
What are some of the issues associted with Poisson regression?

After class

Class video:

Textbook

Xing Liu (2023). Categorical Data Analysis and Multilevel Modeling Using R (1st edition). SAGE Publications Ltd.
- Ch.8
- Ch.9