Simple matching coefficient

The Simple Matching Coefficient (SMC) is a statistic used to measure the similarity between two sets or binary vectors. It provides a way to quantify the degree of similarity based on the presence or absence of certain characteristics. For binary vectors \( A \) and \( B \), each of length \( n \): - \( a \) is the number of features that are present in both \( A \) and \( B \) (i.e., both vectors have a value of 1).