Progress Report of the Ecological Committee on FIFRA Risk Assessment Methods: V. Terrestrial Effects Assessment

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Dose and Effect and Five Areas of Concern

Suite of Methods
Risk Characterization Category	Types of Method	Interpretation	Description of Risk
Quotient	Point estimates of exposure & toxicity	Comparison to "1"	Deterministic
Joint Distributions	Distributions of quotients Exposure & Effects Distributions	Comparison of percentiles to decision criteria Analysis of overlap using statistical methods	Probabilistic
Models	Individual Stage- or age-structured Metapopulation Landscape or spatially explicit	Dependent on characteristics of model	Probabilistic