|
Gamma Г and Vega υ Relationship
Issued on October 27 2010 par Strategies Options
This is another relation between option sensitivities. Gamma - Vega Relationship.
It's possible to express option sensitivities as a combination of each others if interest rates are zero in the Black & Scholes economy.
I - Gamma and Vega
One is able to link Gamma with Vega :
Vega = Γ . σ . S² . T
Γ = option gamma
σ = annualized volatility
S = lspot
T = maturity
This relationship is extremelly useful to grasp the link between implied volatility and historical one.
II - Consequences :
The previous relation can be written as:
Vega / (Γ . T) = cst
It leads to an interesting formula if one integrates from time 0 to T, something as Vega as an integral of gamma.
Next: Black & Scholes : A First Attempt
Previous: Time And Volatility Equivalence
Relationships Between Option Sensitivities - INDEXRelationships Between Option Sensitivities - CHAPTER I
Relationships Between Option Sensitivities - CHAPTER II
Relationships Between Option Sensitivities - CHAPTER III Strategies Options
|