In the above graph, the blue line represents the line of best fit as it lies closest to all the values and the distance between the points outside the line to the line is minimal (i.e., the distance between the residuals to the line of best fit – also referred to as the sums of squares of residuals).
However, the blue line passes through four data points, and the distance between the residual points to the blue line is minimal as compared to the other two lines.
The green line passes through a single point, and the red line passes through three data points. Three lines are drawn through these points – a green, a red, and a blue line. These data points are represented using the blue dots. Let us consider the following graph wherein a set of data is plotted along the x and y-axis. The line of best fit is a straight line drawn through a scatter of data points that best represents the relationship between them. Y-intercept, ‘a’ is calculated using the following formula – Line of Best Fit in the Least Square Regression The slope of line b is calculated using the following formula –
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You are free to use this image on your website, templates etc, Please provide us with an attribution link How to Provide Attribution? Article Link to be Hyperlinked The regression line under the Least Squares method is calculated using the following formula – The objective of least squares regression is to ensure that the line drawn through the set of values provided establishes the closest relationship between the values. A straight line is drawn through the dots – referred to as the line of best fit. These values are represented by the dots in the below graph. These are plotted on a graph with values of x on the x-axis values of y on the y-axis. The variable which is used to predict the variable interest is called the independent or explanatory variable, and the variable that is being predicted is called the dependent or explained variable. Regression Analysis is a statistical method with the help of which one can estimate or predict the unknown values of one variable from the known values of another variable. This line is referred to as the “line of best fit.” Least Squares Regression Method DefinitionĪ least-squares regression method is a form of regression analysis which establishes the relationship between the dependent and independent variable along with a linear line.
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