This article theoretically studies the relationship between two random variables and methods for their evaluation. In particular, in the work under consideration, income and expenses, which are very relevant in practice, are taken as examples of random variables, and their relationship and evaluation methods, as well as their advantages, disadvantages and benefits, are analyzed.

The main findings presented in the article are of theoretical importance and can be widely used in the field of financial mathematics. In addition, the types of financial risks and methods for their evaluation based on international experience can be useful for higher education students, especially students of economics, in calculating specific financial transactions.

Intercept (constant term), Slope (regression coefficient), explanatory, explained, independent and Pearson correlation coefficient.

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