The coefficient of coincidence is a statistical measure used to determine the degree of similarity between two sets of data. There are several synonyms for this term, including the coincidence index, chance-corrected index, and the probability of agreement. The coincidence index is often used in genetics to measure the extent to which two traits are inherited together. The chance-corrected index is used to determine the degree of correlation between two variables, taking into account the possibility of chance. The probability of agreement is another term that is commonly used in statistical analysis, referring to the likelihood that two variables will have identical values. Overall, these synonyms all refer to the same basic concept, measuring the similarity between two sets of data.