Try this: var0=HighD(1); var1=LowD(1); Average(var0,30) - Average(var1,30) In fact, Average function will use HighD(1)[1], but in MC HighD(1)=HighD(1)[1]=HighD(1)[2] Hi, I've read your discussion on calculating average daily range and have tried getting using the "average" function as follows for th...