regressionn.复原；退步；回归（一种数学方法）regression phenomenon退行现象regression estimative回归估计量Regression calibration模拟外推regression forecasting回归预测regression fuzzy model可信性模糊回归模型regression diagnostics回归诊断Regressional Ananlysis回归分析regression calculation回归计算regression to the meann.趋均数回归regression coefficient回归系数,消长系数