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Finance

  

BlackScholesCharm

  

compute the Charm of a European-style option with given payoff

 

Calling Sequence

Parameters

Description

Examples

References

Compatibility

Calling Sequence

BlackScholesCharm(S0, K, T, sigma, r, d, optiontype)

BlackScholesCharm(S0, P, T, sigma, r, d)

Parameters

S0

-

algebraic expression; initial (current) value of the underlying asset

K

-

algebraic expression; strike price

T

-

algebraic expression; time to maturity

sigma

-

algebraic expression; volatility

r

-

algebraic expression; continuously compounded risk-free rate

d

-

algebraic expression; continuously compounded dividend yield

P

-

operator or procedure; payoff function

optiontype

-

call or put; option type

Description

• 

The Charm of an option or a portfolio of options measures Delta's sensitivity to movement in the time to maturity.

Charm=TΔ

Charm=2TS0S

• 

The BlackScholesCharm command computes the Charm of a European-style option with the specified payoff function.

• 

The parameter S0 is the initial (current) value of the underlying asset. The parameter T is the time to maturity in years.

• 

The parameter K specifies the strike price if this is a vanilla put or call option. Any payoff function can be specified using the second calling sequence. In this case the parameter P must be given in the form of an operator, which accepts one parameter (spot price at maturity) and returns the corresponding payoff.

• 

The sigma, r, and d parameters are the volatility, the risk-free rate, and the dividend yield of the underlying asset. These parameters can be given in either the algebraic form or the operator form. The parameter d is optional. By default, the dividend yield is taken to be 0.

Examples

withFinance:

The Delta of an option measures the sensitivity of the option to price changes in the underlying asset, S0. The Charm of an option measures Delta's sensitivity to movement in the time of maturity, T. The following example illustrates the characteristics of the Charm of an option with respect to these two variables.

In this example, the Charm is defined as a function of the underlying asset price S0, and time to maturity, T.  For a European call option, we will assume that the strike price is 100, volatility is 0.10, and the risk-free interest rate of 0.05.  We also assume that this option does not pay any dividends.

CharmBlackScholesCharmS0,100,T,0.1,0.05,0,'call':

plot3dCharm,T=1.0..0,S0=0..200,'labels'=Time To Maturity,Spot Price,Value,'colorscheme'=zgradient,Black,White,Red,'thickness'=0

We can also see how the Charm behaves as a function of the risk-free interest rate, the dividend yield, and volatility.  To compute the Charm of a European call option with strike price 100 maturing in 1 year, we take:

BlackScholesCharm100,100,1,σ,r,d,'call'

4ⅇderfσ2+2d2r24σπdσⅇσ4+4dσ2+4rσ2+4d28dr+4r28σ22σ2+4ⅇdπdσ+2ⅇσ4+4dσ2+4rσ2+4d28dr+4r28σ22d2ⅇσ4+4dσ2+4rσ2+4d28dr+4r28σ22r8σπ

(1)

This can be numerically solved for specific values of the risk-free rate, the dividend yield, and the volatility.

BlackScholesCharm100,100,1,0.3,0.05,0.03,'call'

−0.0239148274

(2)

It is also possible to use the generic method in which the option is defined through its payoff function:

BlackScholesCharm100,t→maxt100,0,1,σ,r,d

ⅇr4πerfσ2+2d2r24σⅇd+rdσ4πⅇd+rdσ+ⅇσ2+2d2r28σ22σ222ⅇσ2+2d2r28σ2d+22ⅇσ2+2d2r28σ2r8σπ

(3)

BlackScholesCharm100,t→maxt100,0,1,0.3,0.05,0.03

−0.02391495679

(4)

CharmBlackScholesCharm100,100,1,σ,r,0.03,'call'

Charm8.10−8181958.5375σ3+181958.5375erf0.707106781r0.02121320343+0.3535533905σ2σσ3+2.56488037106ⅇ0.0000499999999750.σ2+100.r3.2σ2σ20.00125ⅇ0.0000499999999750.σ2+100.r3.2σ2σ2r604924.616ⅇ0.0000499999999750.σ2+100.r3.2σ2σ4+2.419698461106ⅇ0.0000499999999750.σ2+100.r3.2σ2r2145181.9076ⅇ0.0000499999999750.σ2+100.r3.2σ2r+2177.728615ⅇ0.0000499999999750.σ2+100.r3.2σ22.493389254106rⅇ1.0.5000000002rσ2+0.4999999997r20.02999999998r+0.0004499999998+0.01499999999σ2+0.1249999999σ4σ2σ22.49338925106ⅇ1.0.5000000002rσ2+0.4999999997r20.02999999998r+0.0004499999998+0.01499999999σ2+0.1249999999σ4σ2r2+149603.3551rⅇ1.0.5000000002rσ2+0.4999999997r20.02999999998r+0.0004499999998+0.01499999999σ2+0.1249999999σ4σ22244.050326ⅇ1.0.5000000002rσ2+0.4999999997r20.02999999998r+0.0004499999998+0.01499999999σ2+0.1249999999σ4σ22.568190929106ⅇ1.0.5000000002rσ2+0.4999999997r20.02999999998r+0.0004499999998+0.01499999999σ2+0.1249999999σ4σ2σ2623347.3128ⅇ1.0.5000000002rσ2+0.4999999997r20.02999999998r+0.0004499999998+0.01499999999σ2+0.1249999999σ4σ2σ4σ3

(5)

plot3dCharm,σ=0..1,r=0..1

Here are similar examples for the European put option:

BlackScholesCharm100,120,1,0.3,0.05,0.03,'put'

−0.1668222722

(6)

BlackScholesCharm100,t→max120t,0,1,0.3,0.05,0.03,0

−0.1668223310

(7)

References

  

Hull, J., Options, Futures, and Other Derivatives, 5th. edition. Upper Saddle River, New Jersey: Prentice Hall, 2003.

Compatibility

• 

The Finance[BlackScholesCharm] command was introduced in Maple 2015.

• 

For more information on Maple 2015 changes, see Updates in Maple 2015.

See Also

Finance[BlackScholesDelta]

Finance[BlackScholesGamma]

Finance[BlackScholesPrice]

Finance[BlackScholesVanna]

Finance[BlackScholesVera]

Finance[BlackScholesVeta]

Finance[BlackScholesVomma]

Finance[EuropeanOption]

Finance[ImpliedVolatility]

Finance[LatticePrice]