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