regression what is
Definition of regression for developer: to any kind of data. This use of the term 'regression.

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Definition regression

Explain: “...the more general problem of fitting any kind of model to any kind of data. This use of the term 'regression' is a historical accident; it is only indirectly related to the original meaning of the word.”[downey] See also linear regression, logistic regression, principal component analysis.

Different definitions in web development like regression in Dictionary R.