Regression or regressions may refer to:
Arts and entertainment
*
''Regression'' (film), a 2015 horror film by Alejandro Amenábar, starring Ethan Hawke and Emma Watson
*
''Regression'' (magazine), an Australian punk rock fanzine (1982–1984)
*
''Regressions'' (album), 2010 album by Cleric
Computing
*
Software regression, the appearance of a bug in functionality that was working correctly in a previous revision
**
Regression testing
Regression testing (rarely, ''non-regression testing'') is re-running functional and non-functional tests to ensure that previously developed and tested software still performs as expected after a change. If not, that would be called a '' regr ...
, a software testing method which seeks to uncover regression bugs
Hypnosis
*
Age regression in therapy
Age regression in therapy is a psycho-therapeutic process that aims to facilitate access to childhood memories, thoughts, and feelings. Age regression can be induced by hypnotherapy, which is a process where patients move their focus to memorie ...
, a process claiming to retrieve memories
*
Past life regression
Past life regression (PLR), Past life therapy (PLT), regression or memory regression is a method that uses hypnosis to recover what practitioners believe are Past life memory, memories of past lives or reincarnation, incarnations.[Marine regression
A marine regression is a geological process occurring when areas of submerged seafloor are exposed during a drop in sea level. The opposite event, marine transgression, occurs when flooding from the sea covers previously-exposed land.
Descript ...]
, coastal advance due to falling sea level, the opposite of marine transgression
*
Regression (medicine) Regression in medicine is the partial or complete reversal of a disease's signs and symptoms.
*Clinically, regression generally refers to a decrease in severity of symptoms without completely disappearing. At a later point, symptoms may return. The ...
, a characteristic of diseases to express lighter symptoms or less extent (mainly for tumors), without disappearing totally
*
Regression (psychology)
In psychoanalytic theory, regression is a defense mechanism involving the reversion of the ego to an earlier stage of psychosexual development, as a reaction to an overwhelming external problem or internal conflict.
Sigmund Freud invoked the noti ...
, a defensive reaction to some unaccepted impulses
*
Nodal regression
Nodal precession is the precession of the orbital plane of a satellite around the rotational axis of an astronomical body such as Earth. This precession is due to the non-spherical nature of a rotating body, which creates a non-uniform gravitation ...
, 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
In statistics, linear regression is a statistical model, model that estimates the relationship between a Scalar (mathematics), scalar response (dependent variable) and one or more explanatory variables (regressor or independent variable). A mode ...
**
Simple linear regression
In statistics, simple linear regression (SLR) is a linear regression model with a single explanatory variable. That is, it concerns two-dimensional sample points with one independent variable and one dependent variable (conventionally, the ''x ...
**
Logistic regression
In statistics, a logistic model (or logit model) is a statistical model that models the logit, log-odds of an event as a linear function (calculus), linear combination of one or more independent variables. In regression analysis, logistic regres ...
**
Nonlinear regression
In statistics, nonlinear regression is a form of regression analysis in which observational data are modeled by a function which is a nonlinear combination of the model parameters and depends on one or more independent variables. The data are fi ...
**
Nonparametric regression
Nonparametric regression is a form of regression analysis where the predictor does not take a predetermined form but is completely constructed using information derived from the data. That is, no parametric equation is assumed for the relationshi ...
**
Robust regression
In robust statistics, robust regression seeks to overcome some limitations of traditional regression analysis. A regression analysis models the relationship between one or more independent variables and a dependent variable. Standard types of re ...
**
Stepwise regression
In statistics, stepwise regression is a method of fitting regression models in which the choice of predictive variables is carried out by an automatic procedure. In each step, a variable is considered for addition to or subtraction from the set of ...
*
Regression toward the mean
In statistics, regression toward the mean (also called regression to the mean, reversion to the mean, and reversion to mediocrity) is the phenomenon where if one sample of a random variable is extreme, the next sampling of the same random var ...
, a common statistical phenomenon
See also
*
Infinite regress
Infinite regress is a philosophical concept to describe a series of entities. Each entity in the series depends on its predecessor, following a recursive principle. For example, the epistemic regress is a series of beliefs in which the justi ...
, a problem in epistemology
*
Regress (disambiguation)
Regress may refer to:
* Regress argument, a problem in epistemology concerning the justification of propositions
* Infinite regress
Infinite regress is a philosophical concept to describe a series of entities. Each entity in the series depend ...
{{Disambiguation