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Intro to Statistics, Data, and Experimental Design
Intro to Biostatistics (BIOL 327)
August 29, 2025
Fall 2025
William & Mary
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DE II HW#3
DE II HW#3 1-27
ZERO INFLATED DATA
A guided walkthrough of modeling count data with excess zeros.
This project compares Poisson, Negative Binomial, Zero‑Inflated (ZIP/ZINB),
Hurdle, and Bayesian (JAGS) models on simulated cargo shipment data and
the real bioChemists dataset. Model selection is driven by AIC and DIC,
demonstrating when structural zero processes are justified – and when
simpler models win. Includes practical notes on NaN AIC/DIC issues and
numerical stability.
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