| budworm {VGAM} | R Documentation |
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)