aphid {aster} | R Documentation |
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)))