Modeling each auction type
You just saw that the opening bid price appeared not to affect the final sale price of Palm Pilots in the eBay auctions. Now let's look at what happens when you model the three auction types (3 day, 5 day, and 7 day) separately.
auctions is available; dplyr and ggplot2 are loaded.
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Intermediate Regression in R
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# Fit linear regression of price vs. opening bid and auction type, with an interaction.
mdl_price_vs_both <- ___
# See the result
mdl_price_vs_both