Contrast OLS, DiD, and PSM assumptions
Company: Amazon
Role: Data Scientist
Category: Statistics & Math
Difficulty: medium
Interview Round: Technical Screen
Overview: Contrast three ways to estimate whether a free employee shuttle raised participation at sites the business chose to equip: OLS, difference-in-differences, and propensity score matching. Write each regression, state the identifying assumptions, and name the violations to expect when assignment was not random.
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