A proposed longitudinal cross-world weighting estimand is not identified by the proof given, because the derivation silently assumes the two regimes' counterfactual covariate processes coincide.
Nonparametric causal effects based on longitudinal modified treatment policies
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Propensity score weighting across counterfactual worlds: longitudinal effects under positivity violations
A proposed longitudinal cross-world weighting estimand is not identified by the proof given, because the derivation silently assumes the two regimes' counterfactual covariate processes coincide.