Fixed-effects modeling of Cohen's weighted kappa for bivariate multinomial data

Cohen’s kappa and weighted kappa statistics are the conventional methods used frequently in measuring agreement for categorical responses. In this paper, through the perspective of a generalized inverse, we propose an alternative general framework of the fixed-effects modeling of Cohen’s weighted kappa, proposed by Yang and Chinchilli 2011 . Properties of the proposed method are provided. Small sample performance is investigated through bootstrap simulation studies, which demonstrate good performance of the proposed method. When there are only two categories, the proposed method reduces to Cohen’s kappa.