Assuming 30 trading days horizon, DFA Emerging Markets Value I is expected to under-perform the Vanguard. In addition to that, DFA Emerging is 1.08 times more volatile than Vanguard Emerging Mkts Stock Idx. It trades about -0.58 of its total potential returns per unit of risk. Vanguard Emerging Mkts Stock Idx is currently generating about -0.59 per unit of volatility. If you would invest  2,789  in Vanguard Emerging Mkts Stock Idx on May 20, 2013 and sell it today you would lose (248.00) from holding Vanguard Emerging Mkts Stock Idx or give up 8.89% of portfolio value over 30 days.