Alphability are Automated Trader's proprietary tradability metrics. They are environmental statistics intended to assist those building trading models/systems in determining which markets and timeframes are most favourably responsive to which generic types of model. For more information on Alphability, please see page 56 of the Q3 2007 edition of Automated Trader or visit http://www.automatedtrader.net/Alphability.xhtm
Although it came second overall to Alcoa in Q2 in terms of Trend Alphability, the big yellow digging machine tops the bill in Q3. The blow up of the US morning session of May 6th gives an inkling of how it did it.