| Kurtosis provides a good omnibus test for outliers in small samples. | |
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MedLine Citation:
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PMID: 17499683 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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OBJECTIVES: To compare the power of the Healy, single-outlier Grubbs, skewness and kurtosis tests for outliers and their applicability to quality control (QC). DESIGN AND METHODS: Power to detect outliers was calculated in simulated samples of twenty normal variates, one or two of which were shifted in mean or increased in variance. RESULTS: All tests showed similar power against a single outlier. For two outliers shifted in the same direction, skewness then kurtosis were the most powerful; for outliers shifted in opposite directions, Healy's method was just superior to kurtosis. For two outliers of increased variance, these two methods were first equal. CONCLUSIONS: Where the number of outliers is unknown the kurtosis test for outliers is more versatile than the Grubbs test as it has greater power where there is more than one outlier, a similar power when there is just one outlier, and a similar performance in QC. |
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Authors:
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John H Livesey |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2007-04-19 |
Journal Detail:
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Title: Clinical biochemistry Volume: 40 ISSN: 0009-9120 ISO Abbreviation: Clin. Biochem. Publication Date: 2007 Sep |
Date Detail:
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Created Date: 2007-08-28 Completed Date: 2007-11-05 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0133660 Medline TA: Clin Biochem Country: United States |
Other Details:
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Languages: eng Pagination: 1032-6 Citation Subset: IM |
Affiliation:
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Endolab, 21 St. Asaph St., Christchurch Hospital, Private Bag 4710, Christchurch, New Zealand. john.livesey@cdhb.govt.nz |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Algorithms Data Interpretation, Statistical* Laboratory Techniques and Procedures / standards, statistics & numerical data Models, Statistical* Quality Control Reproducibility of Results Sample Size |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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