Test: Geometric coefficient of variation (%)

Add one or several tests for the percentual geometric coefficient of variation (CV) to your assay.

To pass the test, the observed value must be greater than or equal to the lower margin set in the test definition and less than or equal to the upper margin.

The geometric CV is calculated as follows:

GCV ( % ) = 100 ⋅ ( GSD − 1 )

Where GSD is:

GSD = b 1 n − 1 ⋅ ∑ i=1 n ( log b ⁡ ( x i ) − log b ⁡ ( GM ) ) 2

And GM is:

GM = ( ∏ i = 1 n x i ) 1 ⁄ n

Where: b is the chosen base from analysis settings.

Note: The geometric CV is calculated individually for each combination group.

This element has the following attributes:

Data type Multiplicity Usage Default value
Node 0...unbounded optional none

Context:

/Combination of independent assay results/Analysis/Suitability tests/alternatives/