Regression could refer to: Regression (psychology), a defensive reaction to some unaccepted impulses Regression analysis, a statistical technique for estimating the relationships among variables. Regression analysis comes in different flavorsLinear regressionNonlinear regressionStepwise regression Regression toward the mean, a common statistical phenomenon Curve fitting, like Linear least squares Software regression, the appearance of a bug which was absent in a previous revision Regression tes… (More on Regression)