aster2 (version 0.2-1)

echinacea: Life History Data on Echinacea angustifolia

Description

Data on life history traits for the purple coneflower Echinacea angustifolia

Usage

data(echinacea)

Format

An object of class "asterdata" (see asterdata) comprising records for 570 plants observed over three years. Nodes of the graph for one individual are associated with the variables (levels of the factor echinacea$redata$varb)

ld02

Indicator of being alive in 2002. Bernoulli, predecessor the constant one.

ld03

Ditto for 2003. Bernoulli, predecessor ld02.

ld04

Ditto for 2004. Bernoulli, predecessor ld03.

fl02

Indicator of flowering 2002. Bernoulli, predecessor ld02.

fl03

Ditto for 2003. Bernoulli, predecessor ld03.

fl04

Ditto for 2004. Bernoulli, predecessor ld04.

hdct02

Count of number of flower heads in 2002. Zero-truncated Poisson, predecessor fl02.

hdct03

Ditto for 2003. Zero-truncated Poisson, predecessor fl03.

hdct04

Ditto for 2004. Zero-truncated Poisson, predecessor fl04.

Covariates are

pop

the remnant population of origin of the plant (all plants were grown together, pop encodes ancestry).

ewloc

east-west location in plot.

nsloc

north-south location in plot.

Source

Stuart Wagenius, http://www.chicagobotanic.org/research/staff/wagenius

Details

This is the data for the example in Geyer, Wagenius, and Shaw (2007). These data were included in the R package aster which was the predecessor of this package as the dataset echinacea.

References

Geyer, C. J., Wagenius, S., and Shaw, R. G. (2007) Aster Models for Life History Analysis. Biometrika 94 415--426.

Examples

data(echinacea)
names(echinacea)
names(echinacea$redata)
levels(echinacea$redata$varb)