HZIP (version 0.1.1)

salamanders: Salamanders data

Description

This dataset is adapted from the glmmTMB package and contains salamander counts with information on mining status and species. It is intended for illustrating zero-inflated Poisson models with random effects using the hzip() function.

Usage

salamanders

Format

A data frame with 644 rows and 4 variables:

Ind

Individual identifier (factor).

y

Count response variable (integer).

mined

Mining status: "yes" or "no".

spp

Species factor with multiple levels (e.g., GP, PR, DM, etc.).

Details

The dataset was originally included in the glmmTMB package (Brooks et al., 2017), and has been slightly modified for testing the HZIP package.

Examples

# \donttest{
data(salamanders, package = "HZIP")

## Fit zero-inflated Poisson with random effects
fit.salamander <- hzip(y ~ mined | mined + spp + mined * spp,
                       data = salamanders)
summary(fit.salamander)
# }