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发表于 2010-4-8 14:42 | 只看该作者

12: Multiple Regression and Issues in Regression Ana

2010, multiple, center, style

Session 3: Quantitative Methods: Quantitative
Methods for Valuation
Reading 12: Multiple Regression and Issues in Regression Analysis

LOS d: Explain the assumptions of a multiple regression model.

One of the underlying assumptions of a multiple regression is that the variance of the residuals is constant for various levels of the independent variables. This quality is referred to as:

A)	a linear relationship.

B)	a normal distribution.

C)	homoskedasticity.

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发表于 2010-4-8 14:42 | 只看该作者

One of the underlying assumptions of a multiple regression is that the variance of the residuals is constant for various levels of the independent variables. This quality is referred to as:

A)	a linear relationship.

B)	a normal distribution.

C)	homoskedasticity.

Homoskedasticity refers to the basic assumption of a multiple regression model that the variance of the error terms is constant.

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发表于 2010-4-8 14:42 | 只看该作者

Which of the following statements least accurately describes one of the fundamental multiple regression assumptions?

A)	The error term is normally distributed.

B)	The independent variables are not random.

C)	The variance of the error terms is not constant (i.e., the errors are heteroskedastic).

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发表于 2010-4-8 14:43 | 只看该作者

Which of the following statements least accurately describes one of the fundamental multiple regression assumptions?

A)	The error term is normally distributed.

B)	The independent variables are not random.

C)	The variance of the error terms is not constant (i.e., the errors are heteroskedastic).

The variance of the error term IS assumed to be constant, resulting in errors that are homoskedastic.

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发表于 2010-4-8 14:43 | 只看该作者

Assume that in a particular multiple regression model, it is determined that the error terms are uncorrelated with each other. Which of the following statements is most accurate?

A)	Unconditional heteroskedasticity present in this model should not pose a problem, but can be corrected by using robust standard errors.

B)	Serial correlation may be present in this multiple regression model, and can be confirmed only through a Durbin-Watson test.

C)	This model is in accordance with the basic assumptions of multiple regression analysis because the errors are not serially correlated.

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6^#

发表于 2010-4-8 14:43 | 只看该作者

Assume that in a particular multiple regression model, it is determined that the error terms are uncorrelated with each other. Which of the following statements is most accurate?

A)	Unconditional heteroskedasticity present in this model should not pose a problem, but can be corrected by using robust standard errors.

B)	Serial correlation may be present in this multiple regression model, and can be confirmed only through a Durbin-Watson test.

C)	This model is in accordance with the basic assumptions of multiple regression analysis because the errors are not serially correlated.

One of the basic assumptions of multiple regression analysis is that the error terms are not correlated with each other. In other words, the error terms are not serially correlated. Multicollinearity and heteroskedasticity are problems in multiple regression that are not related to the correlation of the error terms.

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