Given investment horizon of 30 days, EchoStar Corp is expected to under-perform the Aastra. But the stock apears to be less risky and, when comparing its historical volatility, EchoStar Corp is 1.08 times less risky than Aastra. The stock trades about -0.04 of its potential returns per unit of risk. The Aastra Technologies Ltd is currently generating about 0.5 of returns per unit of risk over similar time horizon. If you would invest  1,820  in Aastra Technologies Ltd on May 20, 2013 and sell it today you would earn a total of  241.00  from holding Aastra Technologies Ltd or generate 13.24% return on investment over 30 days.