Quality strategy
Seasonality / Calendar
Exploit turn-of-month, “Sell in May” and Santa-rally seasonal patterns — small, well-documented calendar tendencies, best used as a timing nudge, never as a core strategy on their own.
Days–weeks per window; an overlay on a core long-term portfolioBeginner–Intermediate
Calendar-anomalies literature — Robert Ariel (turn-of-month), Sven Bouman & Ben Jacobsen (Halloween effect), Yale Hirsch's “Stock Trader's Almanac” (Santa Claus rally)