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Useful Statistics

Evaluation of a test's bias and imprecision uses several calculations. Although UnityWeb™ performs these calculations, it's useful to understand the calculations, which include:

In This Section


Standard Deviation (SD)

Calculating a Control Mean and Range

Standard Deviation Index (SDI)


Coefficient of Variation (CV)

Determining an Acceptable CV

Coefficient of Variation Ratio (CVR)

Total Error (TE) and Total Allowable Error (TEa)


See Also

Basic QC Statistics