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OF THE THESIS NONPARAMETRIC ASSESSMENT OF SAFETY LEVELS IN ECOLOGICAL RISK ASSESSMENT (ERA) by Limei Chen Florida International University, 2003 Miami, Florida Professor Ling Chen, Major Professor In ecological risk assessment (ERA), it is important to know whether the exposure that animal species receive from a chemical concentration exceeds the desired safety level. This study examined several statistical methods currently being used in ecological risk assessment and reviewed several statistical procedures related to this subject in the literature. Two large sample nonparametric tests were developed for this study. Monte Carlo study showed that these tests performed well even when the sample size was moderately large. A real data set was used to show that the new methodologies provide a good method for assessing the potential risks of pesticides residues at an investigated site.

Nonparametric assessment of safety levels in ecological risk assessment (ERA)