aphid {aster}

Life History Data on Uroleucon rudbeckiae

Description

Data on life history traits for the brown ambrosia aphid Uroleucon rudbeckiae

Usage

data(aphid)

Format

A data frame with records for 18 insects. Data are already in “long” format; no need to reshape.

resp

Response vector.

varb

Categorical. Gives node of graphical model corresponding to each component of resp. See details below.

root

All ones. Root variables for graphical model.

id

Categorical. Indicates individual plants.

Details

The levels of varb indicate nodes of the graphical model to which the corresponding elements of the response vector resp belong. This is the typical “long” format produced by the R reshape function. For each individual, there are several response variables. All response variables are combined in one vector resp. The variable varb indicates which “original” variable the number was for. The variable id indicates which individual the number was for. The levels of varb, which are the names of the “original” variables are the following. S1 through S13 are Bernoulli: one if alive, zero if dead. B2 through B9 are conditionally Poisson: the number of offspring in the corresponding time period. Some variables in the original data that were zero have been deleted.

References

These data were published in the following, where they were analyzed by non-aster methods.

Lenski, R. E. and Service, P. M. (1982). The statistical analysis of population growth rates calculated from schedules of survivorship and fecunidity. Ecology, 63, 655-662. doi:10.2307/1936785.

These data are reanalyzed by aster methods in the following.

Shaw, R. G., Geyer, C. J., Wagenius, S., Hangelbroek, H. H., and Etterson, J. R. (2008) Unifying life history analyses for inference of fitness and population growth. American Naturalist, 172, E35-E47. doi:10.1086/588063.

Examples

data(aphid)
### wide version
aphidw <- reshape(aphid, direction = "wide", timevar = "varb",
    v.names = "resp", varying = list(levels(aphid$varb)))