Home Glossary / Lexicon Glossary R Relative percent difference (RPD)

Latest Articles

  

Popular of last 100 days

  

Environment News
Relative percent difference (RPD) PDF Print E-mail
Friday, 17 November 2006 01:00
A Relative percent difference (RPD) is a measure of precision, calculated by:
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:








































Rn1

(pCi/L)		 Rn2

(pCi/L)		 RPD


(\%)		 COV

(\%)
8 9 12 8
13 15 14 10
17 20 16 11
26 30 14 10
7.5 10 29 20
 

Related Articles

No related article!


Popular incoming links:

These sites are linking to this page. Read how you will get listed here.