Journal Article

Buffered random sampling: a sequential inhibited spatial point process applied to sampling in a trawl survey for northern shrimp <i>Pandalus borealis</i> in West Greenland waters

M.C.S. Kingsley, P. Kanneworff and D.M. Carlsson

in ICES Journal of Marine Science

Published on behalf of ICES/CIEM

Volume 61, issue 1, pages 12-24
Published in print January 2004 | ISSN: 1054-3139
Published online January 2004 | e-ISSN: 1095-9289 | DOI: http://dx.doi.org/10.1016/j.icesjms.2003.11.001
Buffered random sampling: a sequential inhibited spatial point process applied to sampling in a trawl survey for northern shrimp Pandalus borealis in West Greenland waters

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A stratified random sample survey has been carried out since 1988 as a component of the assessment of the stock of northern shrimp Pandalus borealis in offshore West Greenland waters. In 1999, the placing of stations independently and randomly was replaced by buffered random sampling, in which stations were randomly placed but prevented from being closer together than a prescribed limit. Buffered random sampling gave a more even distribution of stations within strata, and nearest-neighbour distances were on average increased by 50%. The statistical effects were difficult to determine, but did not appear to be large, and the estimated standard errors did not change much from previous years. However, the buffered sampling method generated designs in which stations were evenly distributed over the strata, and did away with the need for subjective manual adjustment of the positions of stations which independent random sampling sometimes placed too close to another station.

Keywords: buffered sampling; random sampling; sampling; survey; survey design

Journal Article.  5127 words.  Illustrated.

Subjects: Environmental Science ; Marine and Estuarine Biology

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