@jmwooldridge.bsky.social on Bluesky

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Jeffrey Wooldridge

jmwooldridge.bsky.social

did:plc:v2lx6ewsnvv2pgbaa5rbcek2

Consider the simplest DiD setup with panel data. T = 2, controls X(i) don't change over time. D(i) is the "ever treated" indicator, f2(t) the second period time dummy. W(i,t) the time-varying treatment W(i,t) = D(i)*f2(t). The X(i) appear flexibly to allow selection and heterogeneous trends.

2024-11-20T16:45:38.973Z