  Recently Mart\'in Andr\'es and \'Alvarez Hern\'andez (2024) have proposed new
estimators of various kappa coefficients. These estimators are based on the
unbiased estimator of the expected index of agreement of each population
coefficient. In their article, these authors propose variance formulas based on
the univariate delta method. Here new formulas are proposed that are based on
the multivariate delta method.
