Regression
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Regression could refer to:

• Regression (psychology), a defensive reaction to some unaccepted impulses
• Past life regression, (psychology) a process claiming to retrieve memories of previous lives
• Software regression, (software engineering) the appearance of a bug which was absent in a previous revision
• Regression testing, a software testing which seeks to uncover regression bugs
• Regression toward the mean, a common statistical phenomenon
• Regression analysis, a curve fitting technique, most often utilizing least squares, used in statistics and econometrics, which can be broken into two categories: linear regression and nonlinear regression
• Infinite regression, a problem in epistemology
• Marine regression (geology), coastal advance due to falling sea level, the opposite of marine transgression
• Regression (medicine), a characteristic of diseases to express lighter symptoms without disappearing totally
• Age regression
• Reading regression, a counter-productive reading habbit

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