# Linear Regression

You are a consultant for the Excellent Consulting Group (ECG). You have completed the first assignment, developing and testing a forecasting method that uses Linear Regression (LR) techniques (Module 3 Case). However, the consulting manager at ECG wants to try a different forecasting method as well. Now you decide to try Single Exponential Smoothing (SES) to forecast sales.

Using this Excel template: Data chart for BUS520 Case 4, do the following:

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1. Calculate the MAPE for Year 2 Linear Regression forecast (use the first spreadsheet tab labeled “Year 2 Forecast – MAPE”).
2. Calculate forecasted sales for Year 2 using SES (use the second spreadsheet tab labeled “SES – MAPE”). Use 0.15 and 0.90 alphas.
3. Compare the MAPE calculated for the LR forecast (#1 above) with the MAPEs calculated using SES.

Then

write a report to your boss in which you discuss the results obtained

above. Using calculated MAPE values, make a recommendation concerning

which method appears to be more accurate for the Year 2 data: SES or

Linear Regression.

Analysis

• Accurate and complete SES analysis in Excel.

Written Report

• Length requirements: 4–5 pages minimum (not including Cover and Reference pages). NOTE: You must submit 4–5 pages of written discussion and analysis. This means that you should avoid use of tables and charts as “space fillers.”
• Provide a brief introduction to/background of the problem.
• Complete a written analysis that supports your Excel analysis, discussing the assumptions, rationale, and logic used to complete your SES forecast.
• Give complete, meaningful, and accurate recommendation(s) relating to whether LR or SES is more accurate in predicting sales.

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