A mathematical technique used to explain and/or predict. The general form is Y = a + bX + u, where Y is the variable that we are trying to predict; X is the variable that we are using to predict Y, a is the intercept; b is the slope, and u is the regression residual. The a and b are chosen in a way to minimize the squared sum of the residuals. The ability to fit or explain is measured by the R-square. Bloomberg Financial Dictionary
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Relapse to a less perfect or developed state. Chicago Mercantile Exchange Glossary
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regression UK US /rɪˈgreʃən/ noun [ U or S]
► a situation in which things get worse rather than better: »
There's been a recent rise in nurses' wages after a decade of stagnation or even regression.
»The past years have seen a regression in the march of economic progress.
Financial and business terms. 2012.