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- 2009-12-3
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- 2024-12-26
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【OS_Binomial】
- inputs:
- AssetPr( numeric ),
- StrikePr( numeric ),
- Volty( numeric ),
- DaysToExp( numeric ),
- IntRate( numeric ),
- Carry( numeric ),
- OptType( numeric ),
- EuroAmer01( numeric ),
- Branches( numeric ),
- oBinoTV( numericref ) ;
- variables:
- var0( 0 ),
- var1( 0 ),
- var2( 0 ),
- var3( 0 ),
- var4( 0 ),
- var5( 0 ),
- var6( 0 ),
- var7( 0 ),
- var8( 0 ),
- var9( 0 ),
- var10( 1 / 365 ),
- var11( false ),
- var12( 0 ),
- var13( 0 ),
- var14( 0 ) ;
- arrays:
- arr0[201]( 0 ) ;
- if AssetPr > 0
- and StrikePr > 0
- and Volty > 0
- and DaysToExp > 0
- and IntRate > 0
- and Carry > 0
- then
- begin
- var9 = DaysToExp * var10 ;
- var12 = 1 ;
- var13 = Branches ;
- if var13 > 200 then
- var13 = 200 ;
- if var13 < 5 then
- var13 = 5 ;
- var11 = true ;
- if OptType = Call then
- var8 = 1
- else
- var8 = -1 ;
- var4 = var9 / var13 ;
- if var4 > 0 then
- var1 = ExpValue( Volty * SquareRoot( var4 ) ) ;
- if var1 <> 0 then
- var2 = 1 / var1 ;
- var0 = ExpValue( Carry * var4 ) ;
- if var1-var2 <> 0 then
- var3 = ( var0 - var2 ) / ( var1 - var2 ) ;
- var5 = ExpValue( -IntRate * var4 ) ;
- for var6 = 0 to var13
- begin
- arr0[var6] = MaxList( 0,
- var8 * ( AssetPr * Power( var1, var6 ) * Power( var2, var13 - var6 ) - StrikePr ) ) ;
- end ;
- if EuroAmer01 = 0 then
- begin
- for var7 = var13 - 1 downto 0
- begin
- for var6 = 0 to var7
- begin
- arr0[var6] = ( var3 * arr0[ var6 + 1 ] + ( 1 - var3 )
- * arr0[var6] ) * var5 ;
- end ;
- end ;
- end
- else if EuroAmer01 = 1 then
- begin
- for var7 = var13 - 1 downto 0
- begin
- for var6 = 0 to var7
- begin
- Value1 = var8 * ( AssetPr * Power( var1, var6 ) *
- Power( var2, AbsValue( var6 - var7 ) ) - StrikePr ) ;
- Value2 = ( var3 * arr0[ var6 + 1 ] + ( 1 - var3 ) * arr0[var6] )
- * var5 ;
- arr0[var6] = MaxList( Value1, Value2 ) ;
- end ;
- end ;
- end ;
- var14 = arr0[ 0 ] ;
-
- condition1 = OptType = Put and var14 > StrikePr ;
- if condition1 then
- var14 = StrikePr ;
-
- condition1 = var14 < OS_Intrinsic( AssetPr, OptType, StrikePr ) ;
- if condition1 then
- var14 = OS_Intrinsic( AssetPr, OptType, StrikePr ) ;
- oBinoTV = var14 ;
- end ;
- condition1 = var12 = 0 and DaysToExp >= 0 ;
- if condition1 then
- oBinoTV = OS_Intrinsic( AssetPr, OptType, StrikePr ) ;
- if var11 then
- OS_Binomial = 0
- else
- OS_Binomial = -1 ;
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