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日期:2019-07-18 10:16

BUEC 333 D100 Statistical Analysis of Economic Data

Summer 2019

Assignment 04

due by Thursday, July 18, 11:59 PM

You have created the model to find out what determines the retention rates, in assignment 3. Return to

your model and answer the following 6 questions.

1. Is there any good reason to expect imperfect multicollinearity in your equation? Explain. (2)

2. Test for multicollinearity. Explain your choice of the detection method, show the output of R that

you have used, and present the results (i.e., whether you have detected severe multicollinearity or

not). (4)

3. Is there any good reason to expect serial correlation in your equation? Explain. (2)

4. Test for serial correlation. Explain your choice of the detection method, show the output of R that

you have used, and present the results (i.e., whether you have detected serial correlation or not).

(4)

5. Given the results of all your tests above, discuss in short whether you could make changes to your

original model to improve it. (3)

6. Discuss in short what variables (if they were made available) could be added to your original

model to improve it. (3)


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