Overlapping area represents the amount of risk that can be diversified away by holding Exmo Bitcoin USD and Yobit Bitcoin USD in the same portfolio assuming nothing else is changed. The correlation between historical prices or returns on Yobit Bitcoin USD and Exmo Bitcoin is a relative statistical measure of the degree to which these equity instruments tend to move together. The correlation coefficient measures the extent to which returns on Exmo Bitcoin USD are associated (or correlated) with Yobit Bitcoin. Values of the correlation coefficient range from -1 to +1, where. The correlation of zero (0) is possible when the price movement of Yobit Bitcoin USD has no effect on the direction of Exmo Bitcoin i.e. Exmo Bitcoin and Yobit Bitcoin go up and down completely randomly.