STD/SMA e.t.c. of custom data

Just startign with C# so i find difficulties. 

I need to get SMA or STD of custom data/ selector...

The data I need to calculate the average/std etc is the change of yesterday's low compared to previous day's close. So (low[-1]-close[-2])/close[-2]

how do i put this as the selector of the SMA method?

Thanks in advance for your time guys.

Update Backtest

Update Backtest


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