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可在安卓获取Correlation Coefficient的历史版本
通过输入x和y值计算的相关共同有效
Online calculator to calculate correlation coefficient from a set of statistical data.
Determine cross correlation coefficient r from number of elements, first score and second score of the data.
The range of sample correlation coefficient r, is given by -1 <= r <= 1, where 1 represents strongly positively correlated, -1 represents strongly negatively correlated, 0 represents no correlation.