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How Are the Terms ‘Accuracy’ & ‘Precision’ defined?

The following terms are used and referenced as defined by the International Standards Organization:

  • Accuracy – As defined by ISO 3534:2014: “The closeness of agreement between a test result and the accepted reference value”
  • Precision – As defined by ISO 3534:2014 “The closeness of agreement between independent test results obtained under stipulated conditions. Note 1: Precision depends only on the distribution of random errors and does not relate to the true value or the specified value”
  • Accuracy of the Mean (‘Trueness’ or ‘Bias’) – As described in ISO 5725-1:1994-0.1 there are ‘two terms “trueness” and “precision” to describe the accuracy of a measurement method. “Trueness” refers to the closeness of agreement between the arithmetic mean of a large number of test results and the true or accepted reference value. “Precision” refers to the closeness of agreement between test results’.



Our experimental method measures the precision as the level of agreement of each frame within capture. When the term ‘Accuracy of the mean’ is used, it equates to ‘Trueness’ in the above ISO definition.

Please contact Vicon ([email protected]) for further details or to request a white paper detailing the experimental methods used.