Relative Error
Let the true value of a quantity be 
and the measured or inferred value 
. Then the relative error isdefined by
where
is the Absolute Error. The relative error of the Quotient or Product of a number ofquantities is less than or equal to the Sum of their relative errors. The Percentage Erroris 100% times the relative error.See also Absolute Error, Error Propagation, Percentage Error
References
Abramowitz, M. and Stegun, C. A. (Eds.). Handbook of Mathematical Functions with Formulas, Graphs, and Mathematical Tables, 9th printing. New York: Dover, p. 14, 1972.
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