Sentences with phrase «exact calibration curve»

The radiocarbon determination will be more than two standard deviations (of the combined radiocarbon and calibration uncertainty level) below the exact calibration curve value for the true calendar date in 2.3 % of samples.

The SRLR method sets its 97.7 % bound at two standard deviations above the radiocarbon determination, using the exact calibration curve to convert this to a calendar date.

Not exact matches

The key point here is that the objective Bayesian and the SRLR methods both provide exact probability matching whatever the true calendar date of the sample is (provided it is not near the end of the calibration curve).

One can think of there being a nonlinear but exact functional calibration curve relationship s14C = c (ti) between calendar year ti and a «standard» 14C age s14C, but with — for each calendar year — the actual (true, not measured) 14C age t14C having a slightly indeterminate relationship with ti.

For both variants of the uniform prior subjective Bayesian method, probability matching is nothing like exact except in the unrealistic case where the sample is drawn equally from the entire calibration range — in which case over-coverage errors in some regions on average cancel out with under - coverage errors in other regions, probably reflecting the near symmetrical form of the stylised overall calibration curve.