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Robustness of survival estimates for radio-marked animals

Biometric Bulletin

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Abstract

Telemetry techniques are often used to study the survival of birds and mammals; particularly whcn mark-recapture approaches are unsuitable. Both parametric and nonparametric methods to estimate survival have becn developed or modified from other applications. An implicit assumption in these approaches is that the probability of re-locating an animal with a functioning transmitter is one. A Monte Carlo study was conducted to determine the bias and variance of the Kaplan-Meier estimator and an estimator based also on the assumption of constant hazard and to eva!uate the performance of the two-sample tests associated with each. Modifications of each estimator which allow a re-Iocation probability of less than one are described and evaluated. Generallv the unmodified estimators were biased but had lower variance. At low sample sizes all estimators performed poorly. Under the null hypothesis, the distribution of all test statistics reasonably approximated the null distribution when survival was low but not when it was high. The power of the two-sample tests were similar.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Robustness of survival estimates for radio-marked animals
Series title:
Biometric Bulletin
Volume
9
Issue:
3
Year Published:
1992
Language:
English
Contributing office(s):
Patuxent Wildlife Research Center
Description:
8 (Abstract)
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Biometric Bulletin
First page:
8 (Abstrac