SPY:
http://stockcharts.com/h-sc/ui?s=spy
Create condor from put and call spreads each netting $20 after commissions:
Put Spread
sell 5 Aug 127 put and buy 5 Aug 126 put for a net credit of $35
Commission = $15
Yield = (35 - 15) /(500 -(35 - 15)) = 20/480 = 4.2% IN 26 days or 58% annualized
Prob = 96%
Expectation = .96(20) - .02(480) - .02(240) = 19.2 - 9.6 - 4.8 = 4.8
Call Spread
Sell 5 Aug 142 call and buy 5 Aug 143 call for a net credit of $35
commission = 15
Yield = (35-15)/(500 - (35-15)) = 20/480 = 4.2% in 26 days or 58% annualized
Prob = 85%
Expectation = .85(20) - .11(480) - .04(240) = 17 - 52.8 - 9.6 = -45.4
Put spread is good, call spread is a loser based on probability.
If done separately expectation = 4.8 - 45.4 = -40.6
If done combined:
sell 5 Aug 127 put and buy 5 Aug 126 put & Sell 5 Aug 142 put and buy 5 Aug 143 put for a net credit of $70
Yield = (70 - 30)/(1000 - (70-30)) = 40/960 = 4.2% in 26 days or 58% annualized
Prob = 90.5%
Expectation = .905(13) - .02(87) -.08(87)= 11.8 - 1.76 - 6.9 = 3.14
Can't be wrong both ways at once.
