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Titolo:
Statistical aspects of aquaculture research: optimum block size in pond experiments
Autore:
Smart, TS; Riley, J; Little, DC;
Indirizzi:
IACR Rothamsted, Harpenden AL5 2JQ, Herts, England IACR Rothamsted Harpenden Herts England AL5 2JQ n AL5 2JQ, Herts, England Asian Inst Technol, Sch Environm Resources & Dev, Agr & Aquat Syst Program, Bangkok 12120, Thailand Asian Inst Technol Bangkok Thailand 12120 ogram, Bangkok 12120, Thailand
Titolo Testata:
AQUACULTURE RESEARCH
fascicolo: 1, volume: 32, anno: 2001,
pagine: 65 - 76
SICI:
1355-557X(200101)32:1<65:SAOARO>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Keywords:
aquaculture; pond research; block size; balanced incomplete block; efficiency;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
19
Recensione:
Indirizzi per estratti:
Indirizzo: Riley, J IACR Rothamsted, Harpenden AL5 2JQ, Herts, England IACR Rothamsted Harpenden Herts England AL5 2JQ , Herts, England
Citazione:
T.S. Smart et al., "Statistical aspects of aquaculture research: optimum block size in pond experiments", AQUAC RES, 32(1), 2001, pp. 65-76

Abstract

The sensitivity of any treatment comparisons in pond experiments is often limited by large variability among ponds. Standard techniques of increasingthe number of replicate ponds to account for the large variability may be inappropriate as only a limited number of ponds may be available for any one experiment. This paper considers various 'balanced incomplete block' designs and compares their use with 'completely randomized designs' and 'randomized complete block' designs. With simulated data, it is shown that 'balanced incomplete block' designs can reduce the standard error of a treatment estimate by as much as 50%, and reduce confidence intervals by 25%, althoughincreases of similar sizes may be experienced. The pattern of allocation of blocks to ponds by neighbour or by pond number shows no clear distinctionin estimation improvement. Where missing ponds occur a large increase in imprecision may be experienced. These results are supported by data from nonuniformity experiments, Further work is needed to explore block structures for specific types of treatment that may influence the patterns of variability to different extents.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/12/20 alle ore 09:50:15