Quote from Option_Attack:
Just for fun, here are some quick SPY stats. They are the percent changes from 3rd Fridays for the last 10 years. If doing Condors, keep in mind the marked, greater-than-5% moves:
Code:Third Friday to third Friday changes (at Close) for SPY [/quote] Those % changes look erroneous. Repost with start prices... Also don't forget to factor out dividends as well. I forget if on 3rd Fri or end of month options, but there are some dividend days on opex days for SPY -- already priced into options.