Regression or regressions may refer to:
Science
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Marine regression
A marine regression is a geological process occurring when areas of submerged seafloor are exposed above the sea level. The opposite event, marine transgression, occurs when flooding from the sea covers previously-exposed land.
Evidence of marin ...
, coastal advance due to falling sea level, the opposite of marine transgression
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Regression (medicine) Regression in medicine is a characteristic of diseases to decrease in severity and/or size.
*Clinically, regression generally refers to lighter symptoms without completely disappearing. At a later point, symptoms may return. These symptoms are ...
, a characteristic of diseases to express lighter symptoms or less extent (mainly for tumors), without disappearing totally
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Regression (psychology), a defensive reaction to some unaccepted impulses
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Nodal regression, the movement of the nodes of an object in orbit, in the opposite direction to the motion of the object
Statistics
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Regression analysis
In statistical modeling, regression analysis is a set of statistical processes for estimating the relationships between a dependent variable (often called the 'outcome' or 'response' variable, or a 'label' in machine learning parlance) and one ...
, a statistical technique for estimating the relationships among variables. There are several types of regression:
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Linear regression
In statistics, linear regression is a linear approach for modelling the relationship between a scalar response and one or more explanatory variables (also known as dependent and independent variables). The case of one explanatory variable is cal ...
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Simple linear regression
In statistics, simple linear regression 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'' and ...
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Logistic regression
In statistics, the logistic model (or logit model) is a statistical model that models the probability of an event taking place by having the log-odds for the event be a linear combination of one or more independent variables. In regression an ...
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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 ...
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Nonparametric regression
Nonparametric regression is a category of regression analysis in which the predictor does not take a predetermined form but is constructed according to information derived from the data. That is, no parametric form is assumed for the relationship ...
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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 regr ...
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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 ...
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Regression toward the mean
In statistics, regression toward the mean (also called reversion to the mean, and reversion to mediocrity) is the fact that if one sample of a random variable is extreme, the next sampling of the same random variable is likely to be closer to it ...
, a common statistical phenomenon
Computing
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Software regression
A software regression is a type of software bug where a feature that has worked before stops working. This may happen after changes are applied to the software's source code, including the addition of new features and bug fixes. They may also be ...
, the appearance of a bug which was absent in a previous revision
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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 '' regre ...
, a software testing method which seeks to uncover regression bugs
Hypnosis
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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 memori ...
, a process claiming to retrieve memories
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Past life regression
Past life regression is a method that uses hypnosis to recover what practitioners believe are memories of past lives or incarnations. The practice is widely considered discredited and unscientific by medical practitioners, and experts generally re ...
, a process claiming to retrieve memories of previous lives
Other uses
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Infinite regress
An infinite regress is an infinite series of entities governed by a recursive principle that determines how each entity in the series depends on or is produced by its predecessor. In the epistemic regress, for example, a belief is justified bec ...
, a problem in epistemology
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''Regression'' (film), a 2015 horror film directed and written by Alejandro Amenábar, starring Ethan Hawke and Emma Watson
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''Regressions'' (album), 2010 album by Cleric
See also
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Regress (disambiguation)
{{Disambiguation