Implements Callaway-Sant’Anna (2021) estimator natively.

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StataCorp has a history of maintaining backward compatibility for decades. That means most scripts written in Stata 12 still run in Stata 17. But with version 18, they have broken that tradition in the best possible way—by introducing features that cannot work on older engines.

Previous versions allowed you to call Python via python: , but the output was static. introduces bidirectional data flow between Python and Stata’s reporting engine.