期刊
METHODS IN ECOLOGY AND EVOLUTION
卷 4, 期 6, 页码 585-588出版社
WILEY-BLACKWELL
DOI: 10.1111/2041-210X.12047
关键词
genetic markers; mark-recapture; multiple marks; non-invasive marks; photo-identification
类别
资金
- EPSCoR
- Office Of The Director [814194] Funding Source: National Science Foundation
Mark-recapture studies that rely on multiple marks to identify individuals pose modeling challenges if the marks for each individual are not always linked. If an individual with unlinked marks is encountered on two occasions and different marks are observed, then it will appear that two different individuals were captured. Failing to account for these missed matches will produce incorrect inference. Madon etal. (Methods in Ecology and Evolution 2011; 2: 390) proposes a modification of the Jolly-Seber estimator for such data computed by adjusting the observed counts of individuals first captured, recaptured or not captured but known to be alive on each occasion. The adjustment involves multiplying each of these counts by a constant factor, Iid, intended to correct for double counting of individuals and constrained between 0 and 1. Results of a simulation study provided in Madon etal. (Methods in Ecology and Evolution 2011; 2: 390) show that the proposed estimator is almost unbiased, but its uncertainty is underestimated and the true coverage of confidence intervals is consistently below the nominal value. I compute separate adjustment factors for each of the counts and show (i) that a constant adjustment is not appropriate and (ii) that the theoretical adjustment factor is sometimes >1. I believe that the use of a single adjustment factor between 0 and 1 is what causes the uncertainty to be underestimated and that complete models of the observation process are required to obtain valid results.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据