The Rainbow function calculates the theoretical price, sensitivities, the implied volatility, the implied strike and the implied correlation value of a European style rainbow option (options on the maximum or minimum of two risky assets) using Rubinstein’s model. See Multiple Asset Options for a further explanation.
Rainbow |
(OptionType, ExtremeType, ModelStatistic, Asset1, Asset2, Strike, TimeExpire, Volatility1, Volatility2, InterestRate, YieldRate1, YieldRate2, Correlation, MarketPrice, TimeFormat, InterestType, Yield1Type, Yield2Type) |
Note: Optional arguments are shown in Italics. MarketPrice is not Optional for the Implied Calculations.
Argument |
Description |
OptionType |
Alphanumeric value indicating the type of option: •Call = 1 or "c" (case insensitive) •Put = 2 or "p" (case insensitive) |
ExtremeType |
Alphanumeric value indicating the barrier type: •MaxAsset = 1 or "max" (case insensitive) •MinAsset = 2 or "min" (case insensitive) |
ModelStatistic |
Numeric value indicating the type of function required for the return value: •Theoretical = 1 •Theta = 4 •Rho = 7 •StrikeSensitivity = 11 •ImpliedStrike = 13 •Delta1 = 30 •Delta2 = 31 •Gamma1 = 32 •Gamma2 = 33 •ImpliedVol1 = 34 •ImpliedVol2 = 35 •Vega1 = 36 •Vega2 = 37 •Psi1 = 38 •Psi2 = 39 •Lambda1 = 42 •Lambda2 = 43 •Chi = 48 •ImpliedCorrelation = 50 |
Asset1 |
The price of the underlying asset one. Must be > 0. |
Asset2 |
The price of the underlying asset two. Must be > 0. |
Strike |
The price at which the asset can be purchased if the option is a call or sold if the option is a put. Must be > 0. |
TimeExpire |
Time, expressed in either Days or Years (depending on the TimeFormat value), until the options expiration. Must be > 0. |
Volatility1 |
Annualized volatility of the asset one. Must be > 0. |
Volatility2 |
Annualized volatility of the asset two. Must be > 0. |
InterestRate |
Risk-free interest rate expressed as a percentage. This rate is interpreted as a continuously compounded rate unless otherwise specified in the InterestType argument. Must be > 0. |
YieldRate1 |
Yield, expressed as a percentage (dividends or interest yield), of the first underlying asset price. This rate is interpreted as a continuously compounded rate unless specified otherwise in the Yield1Type argument. |
YieldRate2 |
Yield, expressed as a percentage (dividends or interest yield), of the second underlying asset price. This rate is interpreted as a continuously compounded rate unless specified otherwise in the Yield2Type argument. |
Correlation |
The correlation between the first underlying asset price and the second underlying asset price. Must be -1 < Correlation < 1. |
MarketPrice |
Optional. The selling price of the option in the marketplace. This input is required when implied volatility and strike are calculated. Price must be > 0. |
TimeFormat |
Optional. Alphanumeric value indicating the format of the time arguments (i.e. TimeExpire). If omitted, Days are used as the default. Specified as either: •Days = 0 or "D" (case insensitive) •Years = 1 or "Y" (case insensitive) |
InterestType |
Optional. Alphanumeric value indicating the type of InterestRate to use when evaluating the option. This value is converted to Continuously Compounded for the calculations. If omitted, a Continuously Compounded rate is used. |
Yield1Type |
Optional. Alphanumeric value indicating the type of YieldRate1 to use when evaluating the option. This value is converted to Continuously Compounded for the calculations. If omitted, a Continuously Compounded rate is used. |
Yield2Type |
Optional. Alphanumeric value indicating the type of YieldRate2 to use when evaluating the option. This value is converted to Continuously Compounded for the calculations. If omitted, a Continuously Compounded rate is used. |
Example
Calculate all of functions for a rainbow call on the maximum of two assets where the option is 60 days from expiration. The first asset price is $32, the second asset price is $38, the exercise price is $35, the risk-free interest rate is 6.0% per annum, yield rate of the first and second assets are both 4% per annum, the correlation is 0.25, the annual volatility of the first asset is 20%, and the annual volatility of the second asset is 30%. The interest rates are considered continuous. So, |
Input |
|
Output |
|||
Variable |
Value |
|
Function |
Name |
Value |
OptionType |
Call |
|
1 |
Theoretical: |
3.758206 |
ExtremeType |
1 (MaxAsset) |
|
4 |
Theta: |
-0.013926 |
Asset1: |
32 |
|
7 |
Rho: |
0.043225 |
Asset2: |
38 |
|
11 |
Strike Sensitivity: |
-0.751292 |
Strike: |
35 |
|
13 |
Implied Strike: |
35.010930 |
TimeExpire |
60 |
|
30 |
Delta Asset 1: |
0.036148 |
Volatility1: |
20% |
|
31 |
Delta Asset 2: |
0.760439 |
Volatility2: |
30% |
|
32 |
Gamma 1: |
0.027726 |
InterestRate |
6% |
|
33 |
Gamma 2: |
0.066598 |
YieldRate1: |
4% |
|
34 |
Implied Vol. 1: |
0.188753 |
YieldRate2: |
4% |
|
35 |
Implied Vol. 2: |
0.298229 |
Correlation: |
0.25 |
|
36 |
Vega Vol. 1: |
0.007789 |
MarketPrice: |
3.75 |
|
37 |
Vega Vol. 2: |
0.046395 |
TimeFormat |
Days |
|
38 |
Psi Yield 1: |
-0.001901 |
|
|
|
39 |
Psi Yield 2: |
-0.047501 |
|
|
|
42 |
Lambda 1: |
0.307785 |
|
|
|
43 |
Lambda 2: |
7.688961 |
|
|
|
48 |
Chi: |
-0.123509 |
|
|
|
50 |
Implied Corr: |
0.318976 |
See Also
For a further example on this model see the included Excel Template located in the root directory of the add-in. This example can be accessed through the Multiple Asset Template menu item after the add-in has been installed properly.
A list of all of the possible Error Messages is included for convenience.