Statistical Techniques For Comparing Measurers And Methods Of Measurement: A Critical Review

By J. Ludbrook. Clinical and Experimental Pharmacology and Physiology, 2002

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A note on the linearly weighted kappa coefficient for ordinal scales (2009, methodology): “The disagreement weights49 vij = (i − j)2 are also commonly used (Ludbrook (2002); Agresti (2002)) as50 are the linear disagreement weights vij = |i− j|.51 52 Cohen (1968) showed that if the marginal distributions of the 2 raters are53 the same and if the weights of disagreement are defined as vij…”
Retinal vascular image analysis as a potential screening tool for cerebrovascular disease: a rationale based on homology between cerebral and retinal microvasculatures (2005, methodology): “…a kappa statistic normally reserved for the analysis of agreement for categorical data, and correlation analysis is clearly vulnerable to high values in the presence of systematic bias (Ludbrook, 2002), these values suggest a reasonable level of agreement using computer-assisted vessel measurement.”