Title page for ETD etd-08312001-162742

Type of Document Dissertation
Author Wilcock, Samuel Phillip
URN etd-08312001-162742
Title A New Nonparametric Procedure for the k-sample Problem
Degree PhD
Department Statistics
Advisory Committee
Advisor Name Title
Terrell, George R. Committee Chair
Anderson-Cook, Christine M. Committee Member
Arnold, Jesse C. Committee Member
Foutz, Robert Committee Member
Morgan, John P. Committee Member
  • Error Assumptions
  • Distribution Free
  • One-way Layout
  • k-sample problem
  • Nonparametrics
Date of Defense 2001-08-20
Availability unrestricted
The k-sample data setting is one of the most common data

settings used today. The null hypothesis that is most generally

of interest for these methods is that the k-samples have the

same location. Currently there are several procedures available

for the individual who has data of this type. The most often used

method is commonly called the ANOVA F-test. This test assumes

that all of the underlying distributions are normal, with equal

variances. Thus the only allowable difference in the

distributions is a possible shift, under the alternative

hypothesis. Under the null hypothesis, it is assumed that all k

distributions are identical, not just equally located.

Current nonparametric methods for the k-sample setting require

a variety of restrictions on the distribution of the data. The

most commonly used method is that due to Kruskal and Wallis (1952). The

method, commonly called the Kruskal-Wallis test, does not assume

that the data come from normal populations, though they must

still be continuous, but maintains the requirement that the

populations must be identical under the null, and may differ only

by a possible shift under the alternative.

In this work a new procedure is developed which is exactly

distribution free when the distributions are equivalent and

continuous under the null hypothesis, and simulations are used to

study the properties of the test when the distributions are

continuous and have the same medians under the null. The power of

the statistic under alternatives is also studied. The test bears

a resemblance to the two sample sign type tests, which will be

pointed out as the development is shown.

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