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An investigation into the use of ranked set sampling on grass and grass‐clover swards
Author(s) -
COBBY J. M.,
RIDOUT M. S.,
BASSETT P. J.,
LARGE R. V.
Publication year - 1985
Publication title -
grass and forage science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.716
H-Index - 56
eISSN - 1365-2494
pISSN - 0142-5242
DOI - 10.1111/j.1365-2494.1985.tb01753.x
Subject(s) - quadrat , sampling (signal processing) , selection (genetic algorithm) , mathematics , set (abstract data type) , sampling design , agronomy , statistics , systematic sampling , environmental science , biology , computer science , ecology , artificial intelligence , population , demography , filter (signal processing) , shrub , sociology , computer vision , programming language
Four experiments were conducted to assess the performance of ranked set sampling relative to random sampling for the estimation of herbage mass and clover content in grazed swards. The expected theoretical efficiencies were not observed due to the method of selection of quadrats and the nature of the distribution of herbage mass. Nevertheless there should be worthwhile improvement in precision over random sampling, provided that the quadrats within a set are as well spaced as possible, allowing, if necessary, for visual comparison.