# 計算Black Scholes delta的罷工

The way I understand it, the strike price can be found like this:

Edit:
I basically want to create the volatility smile in (strike,vol)-graph from data found by Bloombergs OVDV function:

## 最佳答案

https://www.researchgate.net/publication/275905055_A_Guide_to_FX_Options_Quoting_Conventions

Most pairs take premium in the foreign (i.e. left hand side) currency. This means that you are paying for an option in the underlying - like paying for an IBM call option with IBM shares - and those shares can be viewed as part of the delta - as a result most pairs use the "include premium" convention. The details are in Wystup's paper and you should read it. The math is easy and it is nice to see everytrhing spelled out for you. The only pairs that "Exclude Premium" are EURUSD, GBPUSD, AUDUSD, NZDUSD - so these calculate delta in the usual way. Also in FX for BBG, the convention is to typically use spot delta for expiries less than a year and forward delta for expiries >= 1 year. Otherwise onlyvix's answer above is fine if you assume that the foreign risk free rate is 0.0%. The actual delta is $e^{-r_ft}N(d1)$ in the exclude premium case.