Joint Distributions

Abstract

In this chapter we will look at situations that occur when we study two discrete random variables at the same time. One example of that sort could be that X is the price of a stock, while Y is the number of that stock that is sold each day. In many cases there can be more or less strong relations between the two variables, and it is important to be able to decide to what extent such relations are present. The theory has much in common with the theory in Chap. 1 In this case we need to take into account that different outcomes are not in general equally probable.