کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4421446 1308513 2011 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Making the right conclusions based on wrong results and small sample sizes: Interpretation of statistical tests in ecotoxicology
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست شیمی زیست محیطی
پیش نمایش صفحه اول مقاله
Making the right conclusions based on wrong results and small sample sizes: Interpretation of statistical tests in ecotoxicology
چکیده انگلیسی

In environmental risk assessments statistical tests are a standard tool to evaluate the significance of effects by pesticides. While it has rarely been assessed how likely it is to detect effects given a specific sample size, it was never analysed how reliable results are if the test preconditions, particularly of parametric tests, are not fulfilled or how likely it is to detect deviations from these preconditions. Therefore, we analyse the performance of a parametric and a non-parametric test using Monte Carlo simulation, focussing on typical data used in ecotoxicological risk assessments. We show that none of the data distributions are normal and that for typical sample sizes of N<20 it is very unlikely to detect deviations from normality. Non-parametric tests performed markedly better than parametric tests, except when data were in fact normally distributed. We finally discuss the impact of using different tests on pesticide risk assessments.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ecotoxicology and Environmental Safety - Volume 74, Issue 4, May 2011, Pages 684–692
نویسندگان
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