December 10th, 2007, 7:12 am
QuoteOriginally posted by: tricky69QuoteOriginally posted by: thomssiYou can't, you need strangle 25 delta quote as well. Between them they define the shape of the skew curve.When you have atm and str you can use the following.vol for 25 delta call = str+rr/2put 25 delta = str-rr/2so if the atm is 4.05 for the 2yr, with rr obviously 0.2 and 2yr flies about 0.2 as well... what would be the calculation to get the vols ?25d call = 4.05 + 0.2 + 0.2/2 = 4.3525d put = 4.05 + 0.2 - 0.2/2 = 4.15