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Sofia University Pharmaceutical Sales Data Final Project

Sofia University Pharmaceutical Sales Data Final Project.

INSTRUCTIONS

1. Use the Pharmaceutical Sales data provided in the handout to run all the possible regressions on

Excel. Save the output tables for each of the equations estimated and print them out.

2. Write the R-square on the Excel template.

3. Which equation is the best? Briefly explain what is the criterion you used (as explained in the

handout) to arrive at that decision.

4. In your own words, briefly explain the problem of multicollinearity: (a) what causes it and (b) what is

the consequence in terms of regressions results in a multiple regression model?

5. Use the example described in the handout (regressions tables with sign and the t-values of the

regressions results) and illustrate the multicollinearity problem, and solution using the Pharmaceutical

data. Pick any equation in 2-variable groupings to support your answer.

Find the combination of 2

variable model in which at least one of the variables happens to have a bad t-statistics in the presence

of the other variable but when run alone it is good

Sofia University Pharmaceutical Sales Data Final Project

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