Selection and Parameterization of Distributions

A critical extra phase to be included when planning probabilistic assessments is the selection and parameterization of distributions, to represent the sources of variability and uncertainty that have been identified in the conceptual model. The issues and approaches involved are discussed elsewhere in this book. 

The resource consumed by this activity may be reduced if standard distributions can be adopted for parameters that are required for many different assessments. However, caution should be exercised to avoid applying default distributions outside the range of problems for which they are appropriate. 

Application of Uncertainty Analysis to Ecological Risk of Pesticides 

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