Uncertainty 01
Uncertainty 01 : (a) The deviation in predicted values from the actual values; may result from lack of data or variability in the data. [AIHA, 2000: Risk Assessment Principles for the Industrial Hygienist]; (b) A lack of confidence in the prediction of a risk assessment that may result from natural variability in natural processes, imperfect or in complete knowledge, or errors in conducting an assessment. [SETAC, 1997: Ecological Risk Assessment Technical Issue Paper] [CENR, 1999: Ecorisk in the Federal Government]; (c) In the conduct of risk assessment (hazard identification, dose_response assessment, exposure assessment, risk characterization) the need to make assumptions or best judgments in the absence of precise scientific data creates uncertainties. These uncertainties, expressed qualitatively and sometimes quantitatively, attempt to define the usefulness of a particular evaluation in making a decision based on the available data. [USEPA, 1995: Benchmark Dose]; (d) Uncertainty represents a lack of knowledge about factors affecting exposure or risk and can lead to inaccurate or biased estimates of exposure. The types of uncertainty include: scenario uncertainty, parameter uncertainty, and model uncertainty. [USEPA, 1997b: Exposure Factors Handbook]
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