DAAG (version 0.37)

moths: Moths Data

Description

The moths data frame has 41 rows and 4 columns. These data are from a study of the effect of habitat on the densities of two species of moth (A and P). Transects were set across the search area. Within transects, sections were identified according to habitat type.

Usage

data(moths)

source

Sharyn Wragg, formerly of Australian National University

Examples

print("Quasi Poisson Regression - Example 8.3")
data(moths)
rbind(table(moths[,4]), sapply(split(moths[,-4], moths$habitat), apply,2, 
sum))
A.glm <- glm(formula = A ~ log(meters) + factor(habitat), family = 
quasipoisson, data = moths)
summary(A.glm)
moths$habitat <- relevel(moths$habitat, ref="Lowerside")
A.glm <- glm(A ~ habitat + log(meters), family=quasipoisson, data=moths)
summary(A.glm)$coef