WARNING: The range of variable Dretwd is so small relative to its mean that there may be loss of accuracy in the computations.
         You may need to rescale the variable to have a larger value of RANGE/abs(MEAN), for example, by using PROC STANDARD M=0;
求高人指教，我回归后日志里出现这样的警告，那我的回归结果是不是就不可靠了？