Subject: Re: look back period
Conclusion: Your composite momentum formula is very well-designed. The flaw in your process is the mandatory 3-month filter. By removing it, you fix the structural weakness of your strategy while strengthening its focus on high-quality, sustainable momentum. This change is highly likely to improve your risk-adjusted returns over time.

I guess the crux of it, is that you don't want stocks that are rocketing up, but ones that are increasing slowly and steadily.

Why not use a weighted average? Any advantage?
sum(12m*4,6m*3,3m*2,1m*1)/10

GD_