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Expert Dialog with Dr. Schimmer

Estimation window adjustement

I am trying to conduct event studies for a large sample and I am using your website tools in order to get my abnormal returns, t-tests.
Your template shows estimation window length as:
-2 ; 2 ; -11 ; 120
However, my teacher told me to examine a larger estimation window, of 240 days, with 40 days prior to the event date. How should I put the data in excel in order to extend the window?

Answer by Dr. Markus Schimmer:
This would require you to change the mentioned parameters as follows: -2; 2; -40; 240