Definition of relative standard deviation :
Same as coefficient of variation.
The standard deviation is a measure of how precise the average is, or how well the numbers in a sequence agree or relate to each other.
It is a measure of random error-the error not easily controlled, and is calculated as the sum of the differences between the numbers in a series from the average of those numbers divided by the number in the series minus one.
It is represented as S.
The relative standard deviation or RSD is as follows
: RSD = 100 x S / average
Source from...
http://www.everythingbio.com/glos/definition.php?word=relative+standard+deviation
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