
Python for Finance

Jegadeesh and Titman (1993) show a profitable momentum trading strategy: buy winners and sell losers. The basic assumption is that within a short time period, such as 6 months, a winner will remain as a winner, while a loser will remain as a loser. For example, we could classify winners from losers based on the last 6-month cumulative total returns. Assume we are in January 1965. The total returns over the last 6 months are estimated first. Then sort them into 10 portfolios according to their total returns from the highest to the lowest. The top (bottom) 10% are labeled as winners (losers). We long winner portfolio and short loser portfolio with a 6-month holding period. The next month, February 1965, we repeat the same procedure. Over January 1965 to December 1989, Jegadeesh and Titman's (1993) empirical results suggest that such a trading strategy would generate a return of 0.95% per month. Based on this result...
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