Question: What is the key advantage of using differences - in - differences analysis compared to a simple before - and - after comparison? DID analysis

What is the key advantage of using differences-in-differences analysis compared to a simple before-and-after comparison?
DID analysis requires less data and is easier to implement
DID analysis can control for time-invariant differences between the treatment and control groups
DID analysis eliminates the need for a control group
DID analysis automatically establishes causality without the need for further statistical tests

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