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What is a least square regression line?

Updated: 4/28/2022
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If you plot data points on a graph the rarely will form a straight line. Least squares is a method of finding a line 'close' to all the data points instead of just guessing and drawing a line that looks good.

If you have a line, then there is an algebraic formula to find the distance from each point to that line. Then using statistics, you can make the statistically averaged distance from each data point as close as possible to a line. The distances are squared, averaged, and the average of those squared distances may be used to find the regression line.

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Q: What is a least square regression line?
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Related questions

What is another name for the regression line?

It is often called the "Least Squares" line.


Why are there two regression lines?

There are two regression lines if there are two variables - one line for the regression of the first variable on the second and another line for the regression of the second variable on the first. If there are n variables you can have n*(n-1) regression lines. With the least squares method, the first of two line focuses on the vertical distance between the points and the regression line whereas the second focuses on the horizontal distances.


Is the least-squares regression line resistant?

No, it is not resistant.It can be pulled toward influential points.


What is regression line?

Regression techniques are used to find the best relationship between two or more variables. Here, best is defined according to some statistical criteria. The regression line is the straight line or curve based on this relationship. The relationship need not be a straight line - it could be a curve. For example, the regression between many common variables in physics will follow the "inverse square law".


What is Least Cubic Method?

"Least Cubic Method" Also called "Generalized the Least Square Method", is new Method of data regression.


A point that is always on the regression line?

(mean x, mean y) is always on the regression line.


What is Definition of linear regression and correlation in statistics?

Whenever you are given a series of data points, you make a linear regression by estimating a line that comes as close to running through the points as possible. To maximize the accuracy of this line, it is constructed as a Least Square Regression Line (LSRL for short). The regression is the difference between the actual y value of a data point and the y value predicted by your line, and the LSRL minimizes the sum of all the squares of your regression on the line. A Correlation is a number between -1 and 1 that indicates how well a straight line represents a series of points. A value greater than one means it shows a positive slope; a value less than one, a negative slope. The farther away the correlation is from 0, the less accurately a straight line describes the data.


What measures the percentage of total variation in the response variable that is explained by the least squares regression line?

coefficient of determination


Is the slope of the Least Squares Regression Line very sensitive to outliers in the x direction with large residuals?

Yes, it is.


Given a linear regression equation of equals 20 - 1.5x where will the point 3 15.5 fall with respect to the regression line?

on the lineGiven a linear regression equation of = 20 - 1.5x, where will the point (3, 15) fall with respect to the regression line?Below the line


What negative correlation indicate?

the negative sign on correlation just means that the slope of the Least Squares Regression Line is negative.


How do you solve regression line?

by regrsioning it.