budworm: Western Spuce Budworm

In VGAM: Vector Generalized Linear and Additive Models

Western Spuce Budworm

Description

Counts of western spuce budworm (Choristoneura freemani) across seven developmental stages (five larval instars, pupae, and adults) on 12 sampling occasions.

Usage

data(budworm)

Format

A data frame with the following variables.

ddeg

Degree days.

total

Sum of stages 1–7.

stage1, stage2, stage3, stage4

Successive stages.

stage5, stage6, stage7

Successive stages.

Details

This data concerns the development of a defoliating moth widespread in western North America (i.e., north of Mexico). According to Boersch-Supan (2021), the insect passes hrough successive stages j=1,\ldots,r, delimited by r-1 moults. The data was originally used in a 1986 publication but has been corrected for two sampling occasions; the data appears in Candy (1990) and was analyzed in Boersch-Supan (2021). See the latter for more references.

Source

Candy, S. G. (1990). Biology of the mountain pinhole borer, Platypus subgranosus Scheld, in Tasmania. MA thesis, University of Tasmania, Australia. https://eprints.utas.edu.au/18864/.

References

Boersch-Supan, P. H. (2021). Modeling insect phenology using ordinal regression and continuation ratio models. ReScience C, 7.1, 1–14.

Examples

budworm
summary(budworm)

VGAM documentation built on Sept. 19, 2023, 9:06 a.m.