Precision 01
Precision 01 : General. (a) Quality of being exactly or sharply defined or stated. [AIHA, 2000: Risk Assessment Principles for the Industrial Hygienist]; (b) (1) The quality of being sharply defined or stated. One measure of precision id the number of distinguishable alternatives from which a measurement wan selected, sometimes indicated by the number of significant digits in the measurement. Another measure of precision is the standard error of measurement, the standard deviation of a series of replicate determinations of the same quantity. See also: Measurement, Problems With Terminology. (2) In statistics, precision is defined as the inverse of the variance of a measurement or estimate. [Last, 1983: A Dictionary of Epidemiology]; (c) A measure of how consistently the result is determined by repeated determinations without reference to any "true" value. [SRA, 1999: Glossary of Risk Analysis Terms]; (d) A measure of the reproducibility of a measured value under a given set of conditions. [USEPA, 1992: GL for Exposure Assessment] [USEPA, 1997b: Exposure Factors Handbook] [Cf. Accuracy]
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