Deutsch: Relative Prozentdifferenz (RPD) / Español: Diferencia porcentual relativa (DPR) / Português: Diferença percentual relativa (DPR) / Français: Différence pourcentage relative (DPR) / Italiano: Differenza percentuale relativa (DPR) /

A Relative percent difference (RPD) is a measure of precision, calculated by the following formula:

A Rd % = [X1 is X2]/Xave x 100

X1 is the concentration observed with the first detector or equipment;
X2 = concentration observed with the second detector, equipment, or absolute value; and
Xave = average concentration = ((X1 + X2) / 2)

The relative percent difference (RPD) and coefficient of variation (COV) provide a measure of precision, but they are not equal. Below are example duplicate radon results and the corresponding values of relative percent difference and coefficient of variation:

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