budworm {VGAM} | R Documentation |
Counts of western spuce budworm (Choristoneura freemani) across seven developmental stages (five larval instars, pupae, and adults) on 12 sampling occasions.
data(budworm)
A data frame with the following variables.
Degree days.
Sum of stages 1–7.
Successive stages.
Successive stages.
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,…,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.
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/
.
Boersch-Supan, P. H. (2021). Modeling insect phenology using ordinal regression and continuation ratio models. ReScience C, 7.1, 1–14.
budworm summary(budworm)