Here is an Excel Spreadsheet testing a strategy for 2 years. I used the 5 EMA-26 EMA of (Nasdaq Up Volume/Total Volume).
Everytime Joe SixPack sees the above calculation hit -18% or lower, he buys QQQ in AH at the closing price for the day. He stays in the position until the calculation oscillates back into positive terrtiory.
You may need to scroll to the right to see the colored columns where I calculate the 5-26 oscillator, total portfolio value and date.
It looks like a 17% portfolio gain after 2 years. There were 9 total "plays", with 8 being successful.