cm.levins: Model of A Resource, An Herbivore, And Two Predators

In LoopAnalyst: A Collection of Tools to Conduct Levins' Loop Analysis

Description

This dataset represents the causal relationships amongst the four variables defined by Levins' 1996 publication in figure 2, page 804.

Usage

data(cm.levins)

Format

A 4 by 4 (-1, 0, 1) matrix with each element having at least one parent and at least one child. The matrix is interpreted as the jth variable has the direct causal effect a[i,j] on variable i.

References

Levins, R. and Schultz, B. B. (1996) Effects of density dependence, feedback and environmental sensitivity on correlations among predators, prey and plant resources: Models and practical implications. Journal of Animal Ecology, 65(6),802-812.

Puccia, C. J. and Levins, R. (1986) Qualitative Modeling of Complex Systems: An Introduction to Loop Analysis and Time Averaging. Cambridge: Harvard University Press.

LoopAnalyst documentation built on May 2, 2019, 5:14 a.m.