Quote from swing-scalper:
Please explain in more detail why the volatility at today's close is attributed to QUANT funds.
Well, I wouldn´t contribute only yesterdays sell-off to Quant trading techniques but maybe you sould read some articles :
Firms Seek Edge Through Speed As Computer Trading Expands
http://online.wsj.com/article/SB116615315551251136.html?mod=hps_us_pageone
or it pays off to read some "quant" research :
Examining "Trend" Characteristics
www.hedgeweek.com/download/2070/Amplitude Capital - Examining Trend Characteristics.pdf
or here :
Short-term trading: The facts of life
http://www.harcourt.ch/manual/swisshedge/2006/q2/special_feature.pdf
This necessitates the focus on highly
liquid exchange-traded futures including stock indices,
fixed income, commodities and foreign exchange. The
strategy is based on a systematic and fully automated directional
program which uses extensive quantitative analysis of real-time price data and sophisticated portfolio methodology
to detect ultra-short to short term market movements.
Speed, cost and efficient execution are critical to the
investment strategy. As a result, our execution is entirely
electronic and utilizes in-house proprietary software to
ensure ultra-fast round times.