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(.):  expert assessments, ranking of alternatives, Kendalls coefficient of concordance, inversion coefficient of concordance, Kendall rank correlation coefficient
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(.):  The presence of high consistency of experts' opinions during a survey indicates the reliability of the results. Kendalls coefficient of concordance is mostly often used for this purpose; this is fairly easy to calculate this measure, but it has some drawbacks. To eliminate some of them, there were introduced other coefficients evaluating the consistency of expert opinions, in particular, the alternative coefficient of concordance. The article defines the inversion coefficient of concordance for the case of no tied ranks, which generalizes the Kendall rank correlation coefficient for surveys of three or more experts. The defined coefficient does not use the squares of rank deviations, as Kendalls coefficient of concordance, but its based on the difference in expert opinions during pairwise comparison of alternatives. There is estimated the number of different values that the inversion coefficient of concordance can take with a different number of experts and alternatives. Acomparison of the distributions of the inversion coefficient of concordance and Kendalls coefficient of concordance for a certain number of experts and alternatives is made. A formula for the average value of the inversion coefficient of concordance for different numbers of experts is proved. The equality of the average values for an even number of experts and the next odd number of experts is shown. The defined inversion coefficient of concordance can be used to assess the consistency of expert opinions, as well as Kendalls coefficient of concordance. For two experts, the application of these coefficients of concordance is similar to Kendalls rank correlation coefficient and Spearmans rank correlation coefficient, respectively.

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