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