gnatty8
Stylish Dinosaur
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- Nov 12, 2006
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Pretty much. Black-Scholes calculation based off 30 day IV. And it's not 87% chance of max profit but that chance of some profit.k
This spread strategy works with either calls or puts and can be bullish or bearish depending if it's a call (bearish) or put (bullish.) You buy one option further from the current price of the stock then sell another option, same expiration date, closer to the money. The one you sell will give a bigger credit than the debit of the one you bought and your risk is limited to the spread between strike prices minus the credit you initially received. That credit is your max profit.
Note if this probability is backed out of BS option value, BS assumes changes in stock prices are normally distributed. In a normally distributed world, a five sigma event (i.e. a one day return that is 5 standard deviations from the mean) is expected to happen less than one day in the years since the end of the last Ice Age. In 2008, there were (by my reckoning) 18 days where returns were greater than 5 sigma. Just some food for thought.