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The definition of κ {textstyle kappa } is as follows: the po being the observed relative correspondence between the evaluators (identical to the precision) and pe is the hypothetical probability of a random overrealite, the observed data being used to calculate the probabilities of each observer who sees each category at random. If the evaluators completely match, then κ = 1 {textstyle kappa =1}. If there is no match between the evaluators other than what is expected by chance (as indicated by pe), κ = 0 {textstyle kappa =0}. It is possible that the statistics are negative[6], implying that there is no effective agreement between the two evaluators or that the agreement is worse than chance. You will find the cross-classification of the results of the condition by two databases and the formulas for calculating the agreed statistics in Supplementary file 1. .