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accuracy
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Accuracy is the degree to which a given quantity is correct and free from error. For example, a quantity specified as 100+/-1 has an (absolute) accuracy of +/-1 (meaning its true value can fall in the range 99-101), while a quantity specified as 100+/-2% has a (relative) accuracy of +/-2% (meaning its true value can fall in the range 98-102).
The concepts of accuracy and precision are both closely related and often confused. While the accuracy of a number x is given by the number of significant decimal (or other) digits to the right of the decimal point in x, the precision of x is the total number of significant decimal (or other) digits.