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Parallel pretrends in Callaway Sant'Anna "did" event study package

As you answered already, this is related to the fact that you are using the a varying base period. You want to use the universal base period. By default, Stata uses a "short-gap-varying base&...
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Parallel pretrends in Callaway Sant'Anna "did" event study package

As it turns out, the issue was resolved when setting the reference period as "universal" instead of "varying", which is a problem when you have long-running linear pretrends as in ...

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