@Happy_Singh @monkeybusiness @vijkris : Guys, do any of you perform forward walk to keep the system variables uptodate with changing market conditions? If yes, what is the cutoff period you generally use? I guess you understand what I am saying.
1. You built a system, perform backtest - looks good
2. With enough sample data in place, you perform optimization and fine tune the variables
--done
3. Now in actual deployement, it is advised to perform a walk forward (with the baseline variables -as derived on step 2), to apply the final touch up.
This is where the question is. So, what is the look back and forward market test we generally use. say (1 year minus last 3 months look back) + (3 months - till date) forward test to fine tune it and repeat this every quarter.
Is there any mathematical model for determining this ratio?