For each paired observation, there are only two scenarios: the difference is either inside or outside the agreement interval. If the difference is outside the chord interval, this pair is called the disordance pair, while the difference is in the agreement interval, this pair is called the match pair. The number of discordance pairs and the number of pairs of coordinates can be determined in a data set with npaarten observations. The objective is to point out that the two measurement methods are either consistent or discorsoant at a certain level, depending on the number of discordance pairs and the number of pairs of matches. If the disk is identified as “sick” and the match is “non-sick,” the receiver identification line (ROC) can be borrowed for a medical test in the ranking  for this objective. As noted in both examples, it is recommended to quantify the study of the agreement at once using the variability-based agreement interval, such as. B the rate of control α -0.05 and the clinical and scientific interval, such as the clinical/scientific judgment included in the evaluation of the agreement. The choice of an appropriate value for the disordance rate and the probability of quantification of the agreement should be discussed prior to the design of the agreement study, as should the choice of the significant level and performance in setting the hypothesis tests. Luiz RR, Costa AJL, Kale PL, Werneck GL. Evaluation of the consent of a quantitative variable: a new graphic approach. J Clin Epidemiol 2003;56:963-7.
A cooperation agreement is required for work involving at least one other research partner in a project. There are many methods for assessing the adequacy of two measurement methods. According to Liao and Capen , existing approaches can be divided into three categories. The first category is the hypothesis test approach that tests the deviation from the perfect match (i.e. the interception equal to 0 and the slope equal to 1). The second category is an index approach that includes the first commonly used correlation coefficient, the intraclassizine correlation coefficient (ICC), the correlation coefficient (CCC)  and the improved CCC  and many others. The improvement in the match coefficient also takes into account the variability of each measurement method in assessing the consistency between the two measurement methods.