I need the forums opinion on which is better for designing a profitable system: Back testing a 15 min system on 2yr of data 50,000 units of historical data say OR Back testing a 4hr system on 4 yrs of data 6,250 units of historical data say Remember the historical data period is not the same, BUT the 15 min data has a larger sample size to back test on As I mentioned in an earlier post I cannot get more than 4 yrs of data on a 4 hr chart and 2 yrs on 15 minutes. This is an IG thing and I cannot change this fact unfortunately my surname is not Buffett or Soros 🙂 Chris