moths {DAAG} | R Documentation |
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.
moths
This data frame contains the following columns:
Bank
,
Disturbed
,
Lowerside
,
NEsoak
,
NWsoak
,
SEsoak
,
SWsoak
,
Upperside
Sharyn Wragg, formerly of Australian National University
print("Quasi Poisson Regression - Example 8.3") 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