Assuming 30 trading days horizon, Jakarta Comp is expected to generate 0.97 times more return on investment than Perdana. However, Jakarta Comp is 1.04 times less risky than Perdana. It trades about -0.2 of its potential returns per unit of risk. Perdana Karya Perkasa Tbk is currently generating about -0.44 per unit of risk. If you would invest  518,876  in Jakarta Comp on May 20, 2013 and sell it today you would lose (34,831) from holding Jakarta Comp or give up 6.71% of portfolio value over 30 days.