AnnouncementReturn lookahead bias patch
Addresses the lookahead bias in AnnouncementReturn from end-of-month announcements described here: #158
Used to generate the October 2024 release (technically, the code was run at the end of September).
Addresses the lookahead bias in AnnouncementReturn from end-of-month announcements described here: #158
Used to generate the October 2024 release (technically, the code was run at the end of September).