Kappa is a form of correlation coefficient. Correlation coefficients cannot be interpreted directly, but a square correlation coefficient called a coefficient of determination (COD) is directly interpretable. The CSB is explained as the amount of variation in the dependent variable that can be explained by the independent variable. While the actual CSB is calculated only on the pearson r, an estimate of the variance taken into account for each correlation statistic can be obtained by quadritating the correlative value. More broadly, squaring the Kappa conceptually translates into accuracy (i.e. error reversal) in the data due to congruence between data collectors. Figure 2 shows an estimate of the amount of correct and erroneous data in the research data sets as a function of the degree of congruence, measured either by overcentage or kappa. .