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Article . 2004 . Peer-reviewed
License: Wiley Online Library User Agreement
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Optimization of ordered distance sampling

Authors: Nielson, Ryan M.; Sugihara, Robert T.; Boardman, Thomas J.; Engeman, Richard M.;

Optimization of ordered distance sampling

Abstract

AbstractOrdered distance sampling is a point‐to‐object sampling method that can be labor‐efficient for demanding field situations. An extensive simulation study was conducted to find the optimum number, g, of population members to be encountered from each random starting point in ordered distance sampling. Monte Carlo simulations covered 64 combinations of four spatial patterns, four densities and four sample sizes. Values of g from 1 to 10 were considered for each case. Relative root mean squared error (RRMSE) and relative bias were calculated for each level of g, with RRMSE used as the primary assessment criterion for finding the optimum level of g. A non‐parametric confidence interval was derived for the density estimate, and this was included in the simulations to gauge its performance.Superior estimation properties were found for g > 3, but diminishing returns, relative to the potential for increased effort in the field, were found for g > 5. The simulations showed noticeable diminishing returns for more than 20 sampled points. The non‐parametric confidence interval performed well for populations with random, aggregate or double‐clumped spatial patterns, but rarely came close to target coverage for populations that were regularly distributed. The non‐parametric confidence interval presented here is recommended for general use. Copyright © 2004 John Wiley & Sons, Ltd.

Country
United States
Keywords

density, point-to-object sampling, spatial pattern, 610, distance sampling, Environmental Sciences

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
20
Top 10%
Top 10%
Average
hybrid