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Concordance correlation coefficient

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The concordance correlation coefficient (Lin, 1989) evaluates the degree to which pairs of observations fall on the 45° line through the origin.

Required input

Select the variables for the two techniques you want to compare.

Concordance correlation coefficient - dialog box


The concordance correlation coefficient ρc contains a measurement of precision ρ and accuracy Cb:

Corcordance correlation coefficient formula


Concordance correlation coefficient - results

Descriptive scale

McBride (2005) suggests the following descriptive scale for values of the concordance correlation coefficient (for continuous variables):

Value of ρcStrength of agreement
< 0.90Poor
0.90 - 0.95Moderate
0.95 - 0.99Substantial
>0.99Almost perfect


See also

External links

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