Parameter characterizing the dispersion of the quantity values being attributed to a measurand, based on the information used.

Note: The parameter may be, for example, a standard deviation or the half-width of an interval, having a stated coverage probability.

1. In assay methodology, confidence interval or fiducial limit used to assess the probable.
2. In toxicology, value used in extrapolation from experimental animals to man (assuming that man may be more sensitive) or from selected individuals to the general population. For example, a value applied to the no-observed-effect-level (NOEL) or no-observed-adverse-effect-level (NOAEL) to derive an acceptable daily intake (ADI) or tolerable daily intake (TDI).