Determinants of price per ounce of cola. Cathy Schaefer, a student of mine, estimated the following regression
Question:
Pi = β0 + β1D1i + β2D2i + β3D3i + μi
Where
Pi = price per ounce of cola
D1i = 001 if discount store
= 010 if chain store
= 100 if convenience store
D2i = 10 if branded good
= 01 if unbranded good
D3i = 0001 if 67.6 ounce (2 liter) bottle
= 0010 if 2833.8 ounce bottles (33.8 oz = 1 liter)
= 0100 if 16-ounce bottle
= 1000 if 12-ounce can
The results were as follows:
The standard errors are shown only to five decimal places.
a. Comment on the way the dummies have been introduced in the model.
b. Assuming the dummy setup is acceptable, how would you interpret the results?
c. The coefficient of D3 is positive and statistically significant. How do you rationalize this result?
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