Which of the following is not a sample property of OLS? a.Sample covariance of each included variable and the residuals is zero b.the sum of all residuals is zero c.the average of all residuals is zero d.the covariance of x and y is on the regression line.

Solution: The Sample properties of OLS are 1) Sum of residuals in any regression model that contains…

Answered: Which of the following is not a sample…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Which of the following is not a sample property of OLS?

	a.	Sample covariance of each included variable and the residuals is zero
	b.	the sum of all residuals is zero
	c.	the average of all residuals is zero
	d.	the covariance of x and y is on the regression line.

Definition Definition Measure of how two random variables change together. Covariance indicates the joint variability or the directional relationship between two variables. When two variables change in the same direction (i.e., if they either increase or decrease together), they have a positive covariance. When the change is in opposite directions (i.e., if one increases and the other decreases), the two variables have a a negative covariance.

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