Lately too, the on the downside since mid-July has swamped the buying days. So, either people are shorting DIA against their portfolios on down days to hedge (like the good old days) or this is just an observation.
You can see now that 169 is a key just overhead. If we see 169, I'll be selling and looking for 166 and change to cover, then will look for 164.5, then 164.0.
Tim 11:05PM EST 10/2/2014