Record Display for the EPA National Library Catalog
RECORD NUMBER: 4 OF 6
|OLS Field Name||OLS Field Data|
|Main Title||Performance of Statistical Tests for Site Versus Background Soil Comparisons When Distributional Assumptions Are Not Met.|
|Author||Englund, E. J. ;|
|CORP Author||Environmental Protection Agency, Las Vegas, NV. National Exposure Research Lab.|
|Additional Subjects||Statistical methods ; Soils ; Tests ; Sampling ; Performance ; Site ; Conceptual models ; Comparisons ; Background ; Non-parametric tests ; Realistic population distributions|
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.