regression

noun
re·​gres·​sion | \ ri-ˈgre-shən How to pronounce regression (audio) \

Definition of regression

1 : the act or an instance of regressing
2 : a trend or shift toward a lower or less perfect state: such as
a : progressive decline of a manifestation of disease
b(1) : gradual loss of differentiation and function by a body part especially as a physiological change accompanying aging
(2) : gradual loss of memories and acquired skills
c : reversion to an earlier mental or behavioral level
d : a functional relationship between two or more correlated variables that is often empirically determined from data and is used especially to predict values of one variable when given values of the others the regression of y on x is linear specifically : a function that yields the mean value of a random variable under the condition that one or more independent variables have specified values
3 : retrograde motion

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Synonyms & Antonyms for regression

Synonyms

retrogression, reversion

Antonyms

advancement, development, evolution, progression

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Examples of regression in a Sentence

the regression to really childish behavior that boys often undergo when put in large groups

Recent Examples on the Web

For an even easier regression of the V-up, hold the ball in your hands and try a Pilates roll down, says Mansour. Jenny Mccoy, SELF, "Work Your Entire Core With This Stability Ball Exercise From Celebrity Trainer Astrid Swan," 10 Apr. 2019 But — paired with Lou Trivino’s recent struggles despite getting the win Thursday — Treinen has made a clear regression. Shayna Rubin, The Mercury News, "3 takeaways from A’s roller-coaster walk-off win capped by Matt Chapman home run," 21 June 2019 The estimates are quite closely related to measures of income and poverty: a simple regression shows that a five-percentage-point increase in the poverty rate is associated with a one-year decline in life expectancy. The Economist, "Black men in America are living almost as long as white men," 14 June 2019 One thing is clear: This Mariners pitching staff needs something, anything, to reverse its recent regression. Mike Vorel, The Seattle Times, "Mariners recall reliever David McKay from Tacoma to aid beleaguered bullpen," 19 May 2019 Also, because the standard move can be quite difficult, Borden provides a beginner-friendly regression at the end. Jenny Mccoy, SELF, "How to Do Nordic Curls to Strengthen Your Hamstrings, Like Celebrity Trainer Ashley Borden," 14 Feb. 2019 More from Mansion In that paper, the researchers used a spatial regression to look at 1,025 single-family homes in 19 suburban Florida neighborhoods located along existing highways. Adam Bonislawski, WSJ, "To Boost Your Home’s Value, Live Near a Highway," 27 Nov. 2018 This burpee regression works your hamstrings and glutes, plus your shoulders and core. Jenny Mccoy, SELF, "A Total-Body HIIT Workout You Can Do in Under 15 Minutes From Celebrity Trainer Jeanette Jenkins," 14 Mar. 2019 Some of this Democratic surge may reflect the weirdness of 2018, and regression to the mean is usually a good bet. Kyle Peterson, WSJ, "Lessons From a Republican Survivor," 4 Jan. 2019

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'regression.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of regression

1583, in the meaning defined at sense 1

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Statistics for regression

Last Updated

18 Jul 2019

Look-up Popularity

Time Traveler for regression

The first known use of regression was in 1583

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More Definitions for regression

regression

noun

Financial Definition of regression

What It Is

Regression is a statistical method used in finance and other fields to make predictions based on observed values. It is a measure of how correlated a group of actual observations are to a model’s predictions.

How It Works

In the following examples, the blue dots represent the going prices for figurine collections on eBay. Collections with more figurines go for as much as $100; collections with fewer than five figurines sell for very little. How can we predict how much a collection will sell for?

We do it using regression analysis, which essentially finds the formula for the line that most closely fits the observations. That way, we can use the line to predict what the price of the collection might be if we know how many figurines are in a collection, or we can predict how many figurines should be in a collection if we know the asking price.

In our example below, the black lines represent a regression line, which is represented by the formula in the top right-hand corner of each chart. This formula is what analysts also use to predict future values of securities based on the behavior of the actual observations.

Goodness of fit is a component of regression analysis. The term refers to how far apart the expected values of a financial model are from the actual values (that is, how predictive the line is).

As you can see, this regression line has a high goodness of fit; the formula for the regression line comes up with the observed values about 79% of the time.

This next chart is an example of a regression line with low goodness of fit. Here, the values are all over the place, and the formula for the regression line was virtually unable to predict anything.

Why It Matters

Regression is a mathematical version of a crystal ball, but a very cracked, blurry crystal ball. Goodness of fit is the key -- it's a confidence measure. This is because when you've come up with a formula that accounts for most of the variations in a group of, say, price observations, you've also come up with a formula that can be a very reliable predictor of what prices will be in the future. And that’s priceless.

Source: Investing Answers

regression

noun
re·​gres·​sion | \ ri-ˈgresh-ən How to pronounce regression (audio) \

Medical Definition of regression

: a trend or shift toward a lower, less severe, or less perfect state: as
a : progressive decline (as in size or severity) of a manifestation of disease tumor regression following radiation
b(1) : a gradual loss of differentiation and function by a body part especially as a physiological change accompanying aging menopausal regression of the ovaries
(2) : gradual loss (as in old age) of memories and acquired skills
c : reversion to an earlier mental or behavioral level or to an earlier stage of psychosexual development in response to organismic stress or to suggestion a protective regression towards childhood— Havelock Ellis

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