The DDD-ITSA design adds a second control group to interrupted time series analysis to isolate intervention effects from remaining time-varying biases.
Challenges to validity in single-group interrupted time series analysis.Journal of Evaluation in Clinical Practice, 23:413–418
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Improving causal inference in interrupted time series analysis: the triple difference design
The DDD-ITSA design adds a second control group to interrupted time series analysis to isolate intervention effects from remaining time-varying biases.