C04 · Lesson 11 of 22 · 15 min · 5 hands-on tasks
Dummy Variables and Interactions
Oil-heated homes save about $500 more. But is it the same $500 for a cottage and a mansion? Put a yes/no category into a regression as a dummy variable, see it shift the line up, then add an interaction and watch the two lines tilt apart. Then turn it into an advert that tells each customer the truth.
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