Conditional methodology for individual case history data |
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Authors: | E. A. Catchpole B. J. T. Morgan T. Coulson |
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Affiliation: | University of New South Wales at the Australian Defence Force Academy, Canberra, Australia.; University of Kent, Canterbury, UK.; University of Cambridge, UK. |
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Abstract: | Summary. Key ecological studies involve the regular censusing of populations of wild animals, resulting in individual case history data which record when marked individuals are seen alive and/or found dead. We show how current conditional methods of analysing case history data may be biased. We then show how a correction can be applied, making use of results from a mark–recovery–recapture analysis. This allows a simple investigation of the effect of time-varying individual covariates such as weight that often contain missing values. The work is motivated and illustrated by the study of Soay sheep in the St Kilda archipelago. |
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Keywords: | Conditional analysis Integrated analysis Mark–recapture–recovery Soay sheep |
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