AN EVALUATION OF MULTIPLE COMPARISONS PROCEDURES IN AGRICULTURAL EXPERIMENTS
AN EVALUATION OF MULTIPLE COMPARISONS PROCEDURES IN AGRICULTURAL EXPERIMENTS
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Date
2008-02
Authors
MOHAMMAD, SANI GALADIMA
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Abstract
The main objective of this study is to test and evaluate the different Methods
(or Procedures) of Multiple Comparisons by determining the conditions
under which each of them is suitable especially in terms of protection
against errors. Data used for this study were generated by means of
computer simulation. The Experiment (Simulation) was repeated 500 times
for every set of conditions, so that empirical estimates for the Error Rates
and the Correct Decision Rate can be computed for each Comparison
Procedure. The result of the study shows that the Methods of Multiple
Comparisons can be classified into two. The first group consist of LSD,
SNK and Duncan, these differ significantly from the MCPs in the second
group and are characterized by high levels of Experiment wise and
Comparison wise type I Error Rates. The second group consists of Tukey’s
HSD, Scheffe, Bonferroni, Sidak, Gabriel and Hochberg, characterized by
relatively low type 1 error rates.
Description
A THESIS SUBMITTED TO THE POSTGRADUATE SCHOOL IN
PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR
THE AWARD OF THE DEGREE OF MASTER
OF SCIENCE IN STATISTICS
DEPARTMENT OF MATHEMATICS
FACULTY OF SCIENCE
AHMADU BELLO UNIVERSITY
ZARIA
NIGERIA.
FEBRUARY, 2008
Keywords
EVALUATION,, MULTIPLE COMPARISONS,, PROCEDURES,, AGRICULTURAL,, EXPERIMENTS.