标题: 12: Multiple Regression and Issues in Regression Ana [打印本页]
作者: 土豆妮 时间: 2010-4-8 14:23 标题: [2010]Session 3:-Reading 12: Multiple Regression and Issues in Regression Ana
Session 3: Quantitative Methods: Quantitative
Methods for Valuation
Reading 12: Multiple Regression and Issues in Regression Analysis
LOS a, (Part 2): Interpret the estimated coefficients and their p-values.
Consider the following estimated regression equation, with calculated t-statistics of the estimates as indicated:
AUTOt = 10.0 + 1.25 PIt + 1.0 TEENt – 2.0 INSt
with a PI calculated t-statstic of 0.45, a TEEN calculated t-statstic of 2.2, and an INS calculated t-statstic of 0.63.
The equation was estimated over 40 companies. Using a 5% level of significance, which of the independent variables significantly different from zero?
作者: 土豆妮 时间: 2010-4-8 14:24
Consider the following estimated regression equation, with calculated t-statistics of the estimates as indicated:
AUTOt = 10.0 + 1.25 PIt + 1.0 TEENt – 2.0 INSt
with a PI calculated t-statstic of 0.45, a TEEN calculated t-statstic of 2.2, and an INS calculated t-statstic of 0.63.
The equation was estimated over 40 companies. Using a 5% level of significance, which of the independent variables significantly different from zero?
The critical t-values for 40-3-1 = 36 degrees of freedom and a 5% level of significance are ± 2.028. Therefore, only TEEN is statistically significant.
作者: 土豆妮 时间: 2010-4-8 14:29
Jacob Warner, CFA, is evaluating a regression analysis recently published in a trade journal that hypothesizes that the annual performance of the S&
500 stock index can be explained by movements in the Federal Funds rate and the U.S. Producer Price Index (PPI). Which of the following statements regarding his analysis is most accurate?
|
A) |
If the p-value of a variable is less than the significance level, the null hypothesis can be rejected. | |
|
B) |
If the p-value of a variable is less than the significance level, the null hypothesis cannot be rejected. | |
|
C) |
If the t-value of a variable is less than the significance level, the null hypothesis cannot be rejected. | |
作者: 土豆妮 时间: 2010-4-8 14:29
Jacob Warner, CFA, is evaluating a regression analysis recently published in a trade journal that hypothesizes that the annual performance of the S& 500 stock index can be explained by movements in the Federal Funds rate and the U.S. Producer Price Index (PPI). Which of the following statements regarding his analysis is most accurate?
|
A) |
If the p-value of a variable is less than the significance level, the null hypothesis can be rejected. | |
|
B) |
If the p-value of a variable is less than the significance level, the null hypothesis cannot be rejected. | |
|
C) |
If the t-value of a variable is less than the significance level, the null hypothesis cannot be rejected. | |
The p-value is the smallest level of significance for which the null hypothesis can be rejected. Therefore, for any given variable, if the p-value of a variable is less than the significance level, the null hypothesis can be rejected and the variable is considered to be statistically significant.
作者: 土豆妮 时间: 2010-4-8 14:30
Which of the following statements most accurately interprets the following regression results at the given significance level?
| Variable |
|
p-value |
| Intercept |
|
0.0201 |
| X1 |
|
0.0284 |
| X2 |
|
0.0310 |
| X3 |
|
0.0143 |
|
A) |
The variables X1 and X2 are statistically significantly different from zero at the 2% significance level. | |
|
B) |
The variable X3 is statistically significantly different from zero at the 2% significance level. | |
|
C) |
The variable X2 is statistically significantly different from zero at the 3% significance level. | |
作者: 土豆妮 时间: 2010-4-8 14:30
Which of the following statements most accurately interprets the following regression results at the given significance level?
| Variable |
|
p-value |
| Intercept |
|
0.0201 |
| X1 |
|
0.0284 |
| X2 |
|
0.0310 |
| X3 |
|
0.0143 |
|
A) |
The variables X1 and X2 are statistically significantly different from zero at the 2% significance level. | |
|
B) |
The variable X3 is statistically significantly different from zero at the 2% significance level. | |
|
C) |
The variable X2 is statistically significantly different from zero at the 3% significance level. | |
The p-value is the smallest level of significance for which the null hypothesis can be rejected. An independent variable is significant if the p-value is less than the stated significance level. In this example, X3 is the variable that has a p-value less than the stated significance level.
作者: 土豆妮 时间: 2010-4-8 14:30
When interpreting the results of a multiple regression analysis, which of the following terms represents the value of the dependent variable when the independent variables are all equal to zero?
作者: 土豆妮 时间: 2010-4-8 14:30
When interpreting the results of a multiple regression analysis, which of the following terms represents the value of the dependent variable when the independent variables are all equal to zero?
The intercept term is the value of the dependent variable when the independent variables are set to zero.
作者: maxsimax 时间: 2010-4-14 16:32
thanks
作者: luqian55 时间: 2010-5-29 21:35
thanks
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