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Standard Deviation Index (SDI)

The standard deviation index is a measurement of bias (how close your value is to the target value). The Bio-Rad Unity Interlaboratory Program uses the consensus group value as the target value. Use the following formula to calculate the SDI:

SDI

In This Section

Interpreting the SDI

See Also

Calculate a Control Mean and Range

Bias

Coefficient of Variation (CV)

Coefficient of Variation Ratio (CVR)

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

z-score