Document Detail


Simulated sampling strategies for nematodes distributed according to a negative binomial model.
MedLine Citation:
PMID:  19295746     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
A FORTRAN computer program was developed to simulate nematode soil sampling strategies consisting of various numbers of samples per field, with each sample consisting of various numbers of soil cores. The program assumes that the nematode species involved fit a negative binomial distribution. Required input data are estimates of the mean and k values, the number of samples per field and cores per sample in the strategy to be investigated, and the number of times the simulation is to be replicated. Output consists of simulated values of the relative deviation from the mean and standard error to mean ratio, both averaged over all replications. The program was used to compare 150 simulated sampling strategies for Meloidogyne incognita, involving all combinations of two mean values (2.0 and 10.0 la.rvae/10 cm(3) soil), three k values (1.35, 0.544, and 0.294), five different numbers of samples per field (1, 2, 4. 10, 20), and five different numbers of cores per sample (1, 2, 4, 10, 20). Simulations resulting from different mean values were similar, but best results were obtained with higher k values and 20 cores per sample. Relatively few 20-core samples were needed to obtain average deviations from the mean of 20-25%.
Authors:
R McSorley
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of nematology     Volume:  14     ISSN:  0022-300X     ISO Abbreviation:  J. Nematol.     Publication Date:  1982 Oct 
Date Detail:
Created Date:  2009-03-19     Completed Date:  2011-07-14     Revised Date:  2013-05-23    
Medline Journal Info:
Nlm Unique ID:  9884299     Medline TA:  J Nematol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  517-22     Citation Subset:  -    
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