Regression

Regression or regressions may refer to:

Science

• Age regression in therapy
• Marine regression, coastal advance due to falling sea level, the opposite of marine transgression
• Past life regression, a process claiming to retrieve memories of previous lives
• Regression (medicine), a characteristic of diseases to express lighter symptoms without disappearing totally
• Regression (psychology), a defensive reaction to some unaccepted impulses
• Regression toward the mean, a common statistical phenomenon

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

All above techniques focus on average relationships between variables by identifying central (average) trends in data (average Y for a given X). Necessary Condition Analysis (NCA) focuses on necessary but not sufficient relations between variables by identifying maximum (ceiling) trends in data (maximum Y for a given X).

Other uses

• Infinite regress, a problem in epistemology
• Regression (film), a horror film directed and written by Alejandro Amenábar, starring Emma Watson
• Regressions (album), 2010 album by Cleric
• Regression testing, a software testing method which seeks to uncover regression bugs
• Software regression, the appearance of a bug which was absent in a previous revision