Component 
Resolution  Exotic Options 




Function Definition 
oX_Lookback_FXStrike_Imp(OptionValue, CallPut, ValueDate, LookbackStart, ExpiryDate, Spot, ObservedLimit, Strike, RiskFree, Carry, Volatility, OutputFlag) Given the option value, calculates an implied value for a fixedstrike lookback option using either Conze and Viswanathan's (1991) method for fullperiod options, or Heynan and Kat's (1994) method for partialperiod options 




Function Parameters 



Parameters 
Description 

Parameter Type 

Restrictions 

. 

OptionValue 

Observed value of the option. 

Double 


CallPut 

Option type. 

Enumerated Constant 

1  Call 

ValueDate 

Valuation date. 

Date 


LookbackStart 

Date upon which the lookback period begins. 

Date 


ExpiryDate 

Expiry date of the option. 

Date 


Spot 

Current market price of the underlying asset. 

Double 

Spot > 0 

ObservedLimit 

Observed maximum/minimum of the price of the underlying asset. 

Double 

ObservedLimit > 0 

Strike 

Strike price of the option. 

Double 

Strike > 0 

RiskFree 

Risk free interest rate, expressed as an annually compounded Actual 365 rate. 

Double 


Carry 

Net cost of carry, expressed as an annually compounded Actual 365 rate. 

Double 


Volatility 

Annualized volatility of the underlying asset, expressed as a decimal. 

Double 

Volatility > 0 

OutputFlag 

Indicates which implied value to return. Note: when entering the function, the parameter for which an implied value is calculated may be left blank. 

Enumerated Constant 

1  Spot 
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