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How to analyze the effect of a policy change?

Analyzing the effect of a policy change typically involves comparing outcomes before and after the change, and comparing those outcomes to a counterfactual scenario in which the change did not occur. ...
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How to correct selection bias in an econometric analysis?

As the other answer mentioned, if the Diff-in-diff assumptions hold, it should not be a problem. However, if you think selection might be invalidating your diff-in-diff assumptions, you have two ...
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How to correct selection bias in an econometric analysis?

The parallel trends assumption of Diff-in-diff is essentially an assumption that there is no selection bias. If you are curious about the parallel trends assumption, I encourage you to ask about it in ...

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