Trend Days

It might just be my imagination, but there seems to have been an awful lot of trend days this year, despite the market going nowhere.  I haven't done a study on how many days ended up in the top 10% or bottom 10% of the daily range, but I think its a big number.  Just as yesterday was a trend down day, things are shaping up for another trend day, to the upside this time.  I don't know if its HFT, quant funds, or just hedge funds running with the herd.  Something has changed from the past.