multicollinearity
Please help with this problem, I want to say that it deals with multicollinearity. Please help me.
© BrainMass Inc. brainmass.com October 16, 2018, 4:44 pm ad1c9bdddfhttps://brainmass.com/economics/regression/multicollinearity-35302
Attachments
Solution Preview
See the attached file.
1) The book-to-market ratio and the size of a company's equity are two factors that have been asserted to be useful in explaining the cross-sectional variation in asset returns. Based on this assertion, you want to estimate the following regression model:
where is the return of asset i,
is the asset i's book-to-market ratio, and
is the market value of asset i's equity
A colleague suggests that this regression specification may be erroneous, because he believes that the book-to-market ratio may be related to the ...
Solution Summary
The solution discusses the problem regarding multicollinearity.
Statistics Problems - Regression Analysis, Autocorrelation, Multicollinearity
1. Suppose an appliance manufacturer is doing a regression analysis, using quarterly time-series data, of the factors affecting its sales of appliances. A regression equation was estimated between appliance sales (in dollars) as the dependent variable and disposable personal income and new housing starts as the independent variables. The statistical tests of the model showed large t-values for both independent variables, along with a high r2 value. However, analysis of the residuals indicated that substantial autocorrelation was present.
a. What are some of the possible causes of this autocorrelation?
b. How does this autocorrelation affect the conclusions concerning the significance of the individual explanatory variables and the overall explanatory power of the regression model?
c. Given that a person uses the model for forecasting future appliance sales, how does this autocorrelation affect the accuracy of these forecasts?
d. What techniques might be used to remove this autocorrelation from the model?
2. Suppose the appliance manufacturer discussed in Exercise 1 also developed another model, again using time-series data, where appliance sales was the dependent variable and disposable personal income and retail sales of durable goods were the independent variables. Although the r2 statistic is high, the manufacturer also suspects that serious multicollinearity exists between the two independent variables.
a. In what ways does the presence of this multicollinearity affect the results of the regression analysis?
b. Under what conditions might the presence of multicollinearity cause problems in the use of this regression equation in designing a marketing plan for appliance sales?
View Full Posting Details