I have recently stumbled upon a great video by NEDL, explaining
the Other January Effect.
In brief, the performance of US Equities in January can predict the coming year’s performance. It’s described nicely in this video:
The other January effect: a predictability anomaly
I used Google Sheets to recreate Savva Shanaev’s results and shared it here:
The Other January Effect Sheet
Feel free to play around with it or use it in your simulation.
