Analysis of External Quality Assessment Results in Three Dimensions

Analysis of External Quality Assessment Results in Three Dimensions

During the last six years there has been a marked change in the nature of interlaboratory variance in enzyme determinations in Finland. With ordinary two-dimensional plotting methods the change is difficult to see, because enzyme activities are different for each control serum. The decrease in the c...

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Veröffentlicht in:Annals of clinical biochemistry 1983-05, Vol.20 (3), p.182-186
Hauptverfasser: Karjalainen, Erkki J, Karjalainen, Ulla
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Sprache:eng
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Analysis of Variance
Animals
Chemistry, Clinical - standards
Enzymes - blood
Finland
Humans
Quality Control
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creator Karjalainen, Erkki J
Karjalainen, Ulla
description During the last six years there has been a marked change in the nature of interlaboratory variance in enzyme determinations in Finland. With ordinary two-dimensional plotting methods the change is difficult to see, because enzyme activities are different for each control serum. The decrease in the coefficient of variation (CV) is best seen when the CV is displayed as a trend surface as a function of time and enzyme activity. While the overall variance has decreased, the shape of the curve relating CV to enzyme activity has also changed. The dependence of CV on the enzyme activity level has decreased slightly. The use of trend surfaces to describe three-dimensional functions in external quality assessment is described.
doi_str_mv 10.1177/000456328302000311
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subjects Analysis of Variance
Animals
Chemistry, Clinical - standards
Enzymes - blood
Finland
Humans
Quality Control
title Analysis of External Quality Assessment Results in Three Dimensions
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