SPDR S&P 500 (SPY)

[leftyg]

The ATR(14) is the default size. I find that is a bit too big for me. I am using a value of 1.5 on the MVV chart..and a ratio-equal value of 1.1 on the MZZ chart. That is about .67 of the ATR value.

In general, one would want to have a box size large enough so that the period being used (15 min, 60 min, daily, weekly) is not whipsawed often within that time frame. For a daily chart, I think that should be about 3-4% to indicate a reversal. You decide for yourself what you think is right.

Remember that whipsaws are return reducers..but you want the box size small enough to capture a good part of the next trend up or down..and, perhaps suprisingly, making the box size much larger does not necessarily eliminate whipsaws..but it will reduce the return. Choosing the best fit of box size is important.

Off to church..see you later on. Regards.