Record Display for the EPA National Library Catalog
RECORD NUMBER: 367 OF 623Main Title | Performance of Statistical Tests for Site Versus Background Soil Comparisons When Distributional Assumptions Are Not Met. | |||||||||||
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Author | Englund, E. J. ; | |||||||||||
CORP Author | Environmental Protection Agency, Las Vegas, NV. National Exposure Research Lab. | |||||||||||
Publisher | Mar 2007 | |||||||||||
Year Published | 2007 | |||||||||||
Report Number | EPA/600/R-07/020; | |||||||||||
Stock Number | PB2007-107708 | |||||||||||
Additional Subjects | Statistical methods ; Soils ; Tests ; Sampling ; Performance ; Site ; Conceptual models ; Comparisons ; Background ; Non-parametric tests ; Realistic population distributions | |||||||||||
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Collation | 56p | |||||||||||
Abstract | Statistical distributions of site and background soil samples often do not meet the assumptions of statistical tests. This is true even of non-parametric tests. This paper evaluates several statistical tests over a variety of cases involving realistic population distribution scenarios and sampling schemes. Over the range of cases, performance was erratic for most tests. When planning a project, the sampling scheme must be designed together with the statistical test, and the choice of test may vary depending on which scenario best matches the conceptual model for the site. |