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SMPTE 274M represents agreement on colorimetry according to the international standard Rec.
The radial axis joining 0 to 180° is a 45° clockwise rotation of the line of identity in the four-quadrant plots, and represents agreement.
The kappa measure lies on a scale from −1 to 1, where negative values represent agreement less than chance, 0 represents agreement no more than chance, and 1 represents perfect agreement [19].
The angle ϴ with the horizontal axis represents agreement between the ∆CI value and reference technique (∆CITPTD).
The upper limit of the κ-coefficient representing total agreement between the raters is 1.0, while a κ-coefficient of 0.0 represents agreement at chance level.
The concordance index is the percentage of patient pairs in which the predicted and observed outcomes coincide, such that c = 0.5 represents agreement by chance and c = 1.0 represents perfect discrimination[ 17].
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The homogeneous agreement model thus has two components: the first representing chance, the second representing agreement.
Note that, both matrices are triangular since they represent agreement and there is no true and predicted value.
GT only represented agreement among three IRs using all available data.
Kappa coefficients represent agreement corrected for chance overlap due to category prevalence.
Kappa can range from -1 to 1, with 0 representing agreement no greater than chance.
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