Regression or regressions may refer to: Science Marine regression, coastal advance due to falling sea level, the opposite of marine transgression Regression (medicine), a characteristic of diseases to express lighter symptoms or less extent (mainly for tumors), without disappearing totally Regression (psychology), a defensive reaction to some unaccepted impulses Nodal regression, the movement of the nodes of an object in orbit, in the opposite direction to the motion of the object Statistics Regression analysis, a statistical technique for estimating the relationships among variables. There are several types of regression: Linear regression Simple linear regression Logistic regression Nonlinear regression Nonparametric regression Robust regression Stepwise regression Regression toward the mean, a common statistical phenomenon Computing Software regression, the appearance of a bug which was absent in a previous revision Regression testing, a software testing method which seeks to uncover regression bugs Hypnosis Age regression in therapy, a process claiming to retrieve memories Past life regression, a process claiming to retrieve memories of previous lives Other uses Infinite regress, a problem in epistemology Regression (film), a 2015 horror film directed and written by Alejandro Amenábar, starring Ethan Hawke and Emma Watson Regressions (album), 2010 album by Cleric See also Regress (disambiguation)