An accuracy is the degree to which a calculation, a measurement, or set of measurements agree with a true value or an accepted reference value. "accuracy includes a combination of random error (precision) and systematic error (bias) components which are due to sampling and analytical operations; a data quality indicator. EPA recommends that this term not be used and that precision and bias be used to convey the information usually associated with accuracy (QAMS 1993, 1)."
further definition:
An Accuracy is the degree of agreement of a measurement (X) with an accepted reference or true value (T); usually expressed as the difference between the two values (X - T), or the difference as a percentage of the reference or true value (100[X - T]/T), and sometimes expressed as a ratio (X/T).
further definition:
An accuracy is a measure of how close repeated trials are to the desired target.

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