Exercise

Evaluating the Poisson GLM

What have you learned about your model, poisson_glm that indicates it is not appropriate for the data?

Note that the dragonflies data set, poisson_glm model, pred_df and diag data frames, custom dispersion() function, and ggplot2 library have been preloaded.

Instructions

50 XP

Possible Answers

Some predicted values of feeding_events are less than 0.
There is heterogeneity in the residuals, and some predicted values of feeding_events are less than 0.
There is overdispersion, but no heterogeneity in the residuals.
There is heterogeneity in the residuals, and overdispersion.