Can someone please explain to me how the underlying index selects the sectors to invest in? I can't quite figure it out from the key investor information: "The Shiller Barclays CAPE® US Sector Value Net TR Index reflects the performance of a dynamic long position in four U.S. equity sectors selected monthly based on their relative CAPE® ratio (cyclically adjusted P/E ratio) and price fluctuations over the previous 12 months (the "12-month price momentum")." Does that mean it invests in the 4 sectors with the lowest P/E ratios and the largest price declines over the previous 12 months?