A DID estimator with bounding and IV strategies that use principal strata for missingness and parallel trends in response rates to identify ATT or ATT among always-respondents without assuming homogeneous effects across missingness patterns.
Assumption 9 (Baseline response indicators as IV for time trend)
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Difference-in-differences Design with Outcomes Missing Not at Random
A DID estimator with bounding and IV strategies that use principal strata for missingness and parallel trends in response rates to identify ATT or ATT among always-respondents without assuming homogeneous effects across missingness patterns.