©Fluke Calibration 2011 Basics Of Measurement Uncertainty for DMM Calibration 35
Statistical terms & concepts
• Probability Distribution: “the scatter of the values”
− Normal or Gaussian
− Rectangular or Uniform
− Triangular, U or bi-modal, …
• Degrees of Freedom: “how many”
− A value related to the amount of information that was employed in
making the estimate.
− Usually equals the sample size minus one (n-1) for type A uncertainties,
and is often considered infinite ( ) for parameters such as
manufacturer specifications
• Sensitivity Coefficient: “how influential”
− Change in measurement response divided by the corresponding change
in stimulus (usually a value of 1 in the case we are considering)
For more information, see technical references on statistics
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