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Survival Analysis in Telemetry Studies: The Staggered Entry Design

Kenneth H. Pollock, Scott R. Winterstein, Christine M. Bunck and Paul D. Curtis
The Journal of Wildlife Management
Vol. 53, No. 1 (Jan., 1989), pp. 7-15
Published by: Wiley on behalf of the Wildlife Society
DOI: 10.2307/3801296
Stable URL: http://www.jstor.org/stable/3801296
Page Count: 9
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Survival Analysis in Telemetry Studies: The Staggered Entry Design
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Abstract

The estimation of survival distributions for radio-tagged animals is important to wildlife ecologists. Allowance must be made for animals being lost (or censored) due to radio failure, radio loss, or emigration of the animal from the study area. The Kaplan-Meier procedure (Kaplan and Meier 1958), widely used in medical studies subject to censoring, can be applied to this problem. We developed a simple modification of the Kaplan-Meier procedure that allows for new animals to be added after the study has begun. We present 2 examples using telemetry data collected from northern bobwhite quail (Colinus virginianus) to show the simplicity and utility of the Kaplan-Meier procedure and its modifications. The log rank test used to compare 2 survival distributions can also be modified to allow for additions during the study. Simple computer programs that can be run on a personal computer are available from the authors.

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