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Fiducial inference applied to uncertainty estimation when identical readings are obtained under low instrument resolution

R B Frenkel

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When identical readings are independently obtained under low instrument resolution d, so that a reading x implies an actual value between x − (d/2) and x + (d/2), the method of fiducial inference yields the result that the commonly assumed standard uncertainty d/\sqrt{12} \approx 0.289d applies only to the case where the input standard deviation is known to be very low, ≈ 0.03d or less. The standard uncertainty d/\sqrt{12} is the standard deviation of a rectangular distribution whose base is of length d. If there is little knowledge of the input standard deviation, the standard uncertainty is closer to d/\sqrt{24} \approx 0.204d . The standard uncertainty d/\sqrt{24} is the standard deviation of a symmetrical (isosceles) triangular distribution whose base is of length d. This latter standard uncertainty increases above d/\sqrt{24} as the number of identical independent readings decreases.


PACS

02.50.Ng Distribution theory and Monte Carlo studies

02.50.Cw Probability theory

06.20.Dk Measurement and error theory

Subjects

Computational physics

Instrumentation and measurement

Dates

Issue 6 (December 2009)

Received 10 June 2009, in final form 24 August 2009

Published 26 October 2009



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