Overlapping area represents the amount of risk that can be diversified away by holding Kraken Bitcoin USD and Coinroom Bitcoin USD in the same portfolio assuming nothing else is changed. The correlation between historical prices or returns on Coinroom Bitcoin USD and Kraken 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 Kraken Bitcoin USD are associated (or correlated) with Coinroom Bitcoin. Values of the correlation coefficient range from -1 to +1, where. The correlation of zero (0) is possible when the price movement of Coinroom Bitcoin USD has no effect on the direction of Kraken Bitcoin i.e. Kraken Bitcoin and Coinroom Bitcoin go up and down completely randomly.