Type A evaluation of measurement uncertainty

Type A evaluation

evaluation of a component of measurement uncertainty by a statistical analysis of measured quantity values obtained under defined measurement conditions [VIM 2008].

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Repeat measurements!     aiuA_weighing_example_data

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Evaluate mean:mean

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Evaluate standard deviation:standdev

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Evaluate standard deviation of mean:meansd

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Evaluate standard measurement uncertainty:

uA

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Note that a standard uncertainty corresponds to one-half of a 1-sigma confidence interval which is expanded with the 68% Student t-factor for the appropriate number of degrees of freedom

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uA_weighing_example

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