Good afternoon everyone,

I am conducting a study on covid-19 using event study methodology in an emerging market. For this, I need to calculate abnormal returns of the on different event windows. I have some questions:

1. How to determine the appropriate length of the event window?

2. How to decide the number of trading days prior to and after event day to calculate event window?

Appreciate your advice with justification.

Many thanks in advance.

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