Corey J. A. Bradshaw, David W. Sims, and Graeme C. Hays. 2007. Measurement error causes scale-dependent threshold erosion of biological signals in animal movement data. Ecological Applications 17:628–638.


Supplement

Computer code (R language) to derive the power-law tail probability density function and to simulate idelaized Lévy flight tracks.
Ecological Archives
A017-025-S1
.

Copyright


Authors
File list (downloads)
Description


Author(s)

Corey J. A. Bradshaw
School for Environmental Research
Institute od Advanced Studies
Charles Darwin University
Darwin, Northern Territory 0909, Australia
E-mail: corey.bradshaw@cdu.edu.au


File list

powerlawtail.txt -- R code needed to derive the power-law tail probability density function.
tracksim.txt -- R code needed to simulate tracks based on the power-law tail probability density function.

Description

The powerlawtail.txt R code generates an idealized Lévy flight power-law tail probability density function based on µ = 2 and = 1. The code also provides a sampling 'check' function to determine µ from the relationship between the log of the step length frequencies and the log of the step lengths (corrected for the appropriate binning procedure as discussed in Appendix A and the main text of the paper). The tracksim.txt R code uses the idealized Lévy flight power-law tail probability density function to simulate animal movement tracks over 365 days assuming random turn angles after each step.


ESA Publications | Ecological Archives | Permissions | Citation | Contacts