可以使用ceshi程序算出大盘和个股相关系数走势a,b,值并只能选股,在一定期间选择增值最高的股票持有并定期更改，以实现比较高的收益率回报(This program can be used to calculate the A, B, value, and only stock selection. In a certain period, the highest value added stock is chosen to be held and changed regularly to ac