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Key and supplementary comparisons - Results
CCQM-K58
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CCQM-K58
Results
Laboratory individual
measurements

Equivalence
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Degrees
of equivalence

Graph(s)
of equivalence

MEASURAND : Mass fraction of Al in silicon nitride powder
NOMINAL VALUE : 824 mg/kg

The key comparison reference value, xR, is computed as the arithmetic mean of the participant's results. Its expanded uncertainty (k = 2) is UR = 2uR, where uR is the standard deviation of the mean.

xR = 824.4 mg/kg, UR = 15.6 mg/kg

The degree of equivalence of laboratory i relative to the key comparison reference value is given by a pair of terms, both expressed in (mg/kg):
Di = (xi - xR) and its expanded uncertainty (k = 2) Ui = (ULab i2 + UR2)1/2.

The degrees of equivalence between pair of laboratories have not been computed for this key comparison.