Please take a look at my StatArb strategy algo and feel free to modify it and improve it. Some might say sharing is caring and I think the same.
Regardless of the liquidity problems that it may incounter, what do you think about it? It's a personal strategy and, because I spent only 2 days playing with the algo's conditions and constants, it certainly needs more than one brain to make it work beautifully.
Search for 'A' type & 'B' type stocks that gained 20% in the past five days. An 'A' type stock has a last month bearish trend and a 'B' type stock has a bullish trend for the last month. Short A, long B with a hedge ratio close to 1 and voilà, you have a StatArb Reversion strategy. Expect the closing of the A versus B gap to make money.
But something is missing: feel free to play with the different parameters and check for new patterns to add in the position opening/closing conditions and share the new backtests.