👉 Biserial is a statistical concept in psychology that refers to two independent variables that are related but not directly proportional. In other words, they do not have a direct relationship with each other and therefore cannot be considered as completely independent. Instead, these variables can be thought of as having some sort of correlation or association between them. For example, if one variable is taller than the other, it could be said that the first variable is "bigger" than the second variable because they are both related