问题如下:
The proper selection of factors to include in an ordinary least squares estimation is critical to the accuracy of the result. When does omitted variable bias occur?
选项:
A. Omitted
variable bias occurs when the omitted variable is correlated with the included
regressor and is a determinant of the dependent variable.
B. Omitted
variable bias occurs when the omitted variable is correlated with the included
regressor but is not a determinant of the dependent variable.
C. Omitted
variable bias occurs when the omitted variable is independent of the included
regressor and is a determinant of the dependent variable.
D. Omitted
variable bias occurs when the omitted variable is independent of the included
regressor but is not a determinant of the dependent variable.
解释:
A is correct.
考点Omit Variable
解析Omitted variable bias occurs when a model improperly omits one or more variables that are critical determinants of the dependent variable and are correlated with one or more of the other included independent variables. Omitted variable bias results in an over-or under-estimation of the regression parameters.
Omitted variable 会underestimate 是在与independent variable 负相关的情况下吗?