regressiä

Regressió is the Catalan noun for regression, from Latin regressio. It denotes the act or process of returning to a previous state or level and is used in several disciplines to describe a backward change or simplification rather than a forward progression.

In statistics and data analysis, regressió refers to regression analysis, a method for modeling the relationship between a dependent variable and one or more independent variables. Common forms include simple linear regression, multiple regression, and generalized linear models. Core concepts include the estimation of coefficients, residuals, and measures of fit such as R-squared, as well as assumptions about linearity, homoscedasticity, and normality of errors. Regression is also used for forecasting and for exploring associations, with caveats about causation and model specification. Regression to the mean is a related phenomenon sometimes described as regressió a la mitjana in Catalan.

In psychology and psychiatry, regressió refers to a defense mechanism or developmental phenomenon in which an individual reverts to earlier patterns of behavior, thought, or functioning in response to stress, threat, or conflict. Clinically, it is described in psychodynamic theories and can vary in intensity and duration. It is not a mental disorder by itself but a process that may occur within broader conditions.

More generally, regressió can denote any move backward or simplification in processes or sequences, including biological, social, or linguistic contexts. The term is widely understood in Catalan-speaking contexts and is often translated as regression in English, with field-specific terms used as appropriate.