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Analysis of finite population surveys : sample size and testing considerations



Graduation date: 1996This dissertation concerns two topics in the analysis of finite population surveys:\ud setting sample size and hypothesis testing. The first concerns the a priori determination\ud of the sample size needed to obtain species members. The second concerns\ud testing distributional hypotheses when two equal-size populations are sampled.\ud Setting sample size to obtain species is a problem which arises when an investigator\ud wants to obtain (1) a member of all species present in an area (2) a member of all\ud species whose relative frequency is greater than, say, 20% or (3) a member of each\ud species in a target set of species. Chapter 2 presents a practical solution to these\ud questions by setting a target sample size for which the species are obtained with\ud known probability. The solution requires the estimated relative frequency of the\ud rarest species of interest; total number of species is not needed. Because this problem\ud has substantial computational demands, easy-to-compute formulas are needed and\ud given. Three practical examples are presented.\ud Testing of finite population distributional hypotheses is covered in Chapter 3. The\ud test proposed here works under reasonably general designs and is based on a Horvitz-Thompson type correction of the usual Mann-Whitney U statistic. The investigation\ud here compared this proposed test to a corrected (for finiteness) form of the usual\ud Wilcoxon rank sum test. Size and power of the two test procedures are investigated\ud using simulation. The proposed test had approximately correct nominal size over a\ud wide range of situations. The corrected Wilcoxon test exhibited extreme violations\ud in size in many cases. Power of the two tests in situations where they have equal size\ud is similar in most practically interesting cases

Year: 1996
OAI identifier: oai:ir.library.oregonstate.edu:1957/35277
Provided by: ScholarsArchive@OSU

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