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J Econ Entomol. 2004 Jun;97(3):1132-6.

Accounting for cluster sampling in constructing enumerative sequential sampling plans.

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  • 1Department of Primary Industries (Knoxfield), Private Bag 15, Ferntree Gully Delivery Centre, Victoria 3156, Australia. Andrew.Hamilton@dpi.vic.gov.au

Abstract

Green's sequential sampling plan is widely used in applied entomology. Green's equation can be used to construct sampling stop charts, and a crop can then be surveyed using a simple random sampling (SRS) approach. In practice, however, crops are rarely surveyed according to SRS. Rather, some type of hierarchical design is usually used, such as cluster sampling, where sampling units form distinct groups. This article explains how to make adjustments to sampling plans that intend to use cluster sampling, a commonly used hierarchical design, rather than SRS. The methodologies are illustrated using diamondback moth, Plutella xylostella (L.), a pest of Brassica crops, as an example.

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