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Precision is best expressed in terms of the standard deviation or the relative percent difference (RPD) between field duplicate measurements. From USEPA: RPD = [(x1 – x2) / {(x1 + x2)/2}] x 100 . RPD = relative percent difference (%) x1 and x2 = duplicate measurements of the same parameter. The smaller the RPD, the more precise are the ... ................
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