中文说明：
用matlab实现去趋势互相关分析的DCCA算法，将两组数据分析其协方差，最后得到DCCA指数，并进行T检验。
English Description：
The DCCA algorithm of detrended cross-correlation analysis is realized with MATLAB. The covariance of two groups of data is analyzed, and finally the DCCA index is obtained and t-test is carried out.