Asset Comparison and Correlation

Allowing for 30-days total investment horizon, Ecopetrol SA is expected to under-perform the Petrobras. But the stock apears to be less risky and, when comparing its historical volatility, Ecopetrol SA is 1.63 times less risky than Petrobras. The stock trades about -0.4 of its potential returns per unit of risk. The Petrobras Argentina SA is currently generating about -0.05 of returns per unit of risk over similar time horizon. If you would invest  474.00  in Petrobras Argentina SA on April 23, 2013 and sell it today you would lose (32.00) from holding Petrobras Argentina SA or give up 6.75% of portfolio value over 30 days.