# What degrees of freedom means in uncertainty budget and how do I set the value

#### garyf2017

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Hi,

Just want to ask what degree of freedom means in uncertainty budget and how do I set value for this?

#### blueicecube2

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degree of freedom helps to propagate the probability value that we work on when calculating measurement uncertainty.

what value should you use depends on your sample size and the probability distribution that fits your scenario best

#### itsbiodiversity

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Degrees of freedom for type A uncertainties are the degrees of freedom for the respective standard deviations. Degrees of freedom for Type B evaluations may be available from published reports or calibration certificates. Special cases where the standard deviation must be estimated from fragmentary data or scientific judgment are assumed to have infinite degrees of freedom; for example,
Worst-case estimate based on a robustness study or other evidence

Estimate based on an assumed distribution of possible errors

Type B uncertainty component for which degrees of freedom are not documented

Repeatability degrees of freedom would be n - 1 where n is the number of samples taken.

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