termstructure daycounter and put/call parity

[Roland Lichters]

Hello all,

the QuantLib test-suite (capfloor.cpp) checks that the put/call parity (capNPV - floorNPV = swapNPV) holds. It seems to me that this test is passed successfully only as long as one chooses  term structure daycount Actual360(), see function setup() in capfloor.cpp.

After setting this to e.g. ActualActual(ActualActual::ISDA) and keeping anything else unchanged, the test suite fails with the following messages ..

Running 236 test cases...
capfloor.cpp(283): fatal error in "CapFloorTest::testParity": put/call parity violated:
    length:      1 years
    volatility:  1.000000 %
    strike:      3.000000 %
    cap v alue:   2.01507
    floor value: 0
    swap value:  1.94683

.. because the  cap price is overstated.

I assume that the term structure daycounter should not have this effect on pricing results. Shouldn't it be arbitrary?

Would you please have a quick look and correct me if I am wrong.

I noticed this while building a small caplet volatility bootstrap tool that I'd like to contribute (eventually) if there is any interest.  

Many thanks for your efforts,

Roland

 

 

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[Luigi Ballabio]

On 07/18/2006 01:55:44 PM, Roland Lichters wrote:
> the QuantLib test-suite (capfloor.cpp) checks that the put/call  
> parity (capNPV - floorNPV = swapNPV) holds. It seems to me that this  
> test is passed successfully only as long as one chooses term  
> structure daycount Actual360(), see function setup() in capfloor.cpp.
>
> I assume that the term structure daycounter should not have this
> effect on pricing results. Shouldn't it be arbitrary?

Yes and no. For instance, the swap price changes---the coupons will  
have the same fixings, but the discount factors will change due to the  
different day-count convention. The change has a smaller effect on the  
cap and floor (where fixing and discounting are not so neatly  
separated) hence the failure. I've put a warning in the documentation  
for the Black engine until we figure out what to fix.

Later,
        Luigi

P.S. Yes, the caplet-bootstrapping tool would be interesting.


----------------------------------------

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-- Groucho Marx

[Ferdinando M. Ametrano-3]

Hi Roland

 

the bug it's been fixed on the CVS trunk. Please let me know if you still have problem

 

ciao -- Nando

 

On 7/18/06, Roland Lichters <[hidden email]> wrote:

Hello all,

the QuantLib test-suite (capfloor.cpp) checks that the put/call parity (capNPV - floorNPV = swapNPV) holds. It seems to me that this test is passed successfully only as long as one chooses  term structure daycount Actual360(), see function setup() in capfloor.cpp.

After setting this to e.g. ActualActual(ActualActual::ISDA) and keeping anything else unchanged, the test suite fails with the following messages ..

Running 236 test cases...
capfloor.cpp(283): fatal error in "CapFloorTest::testParity": put/call parity violated:
    length:      1 years
    volatility:  1.000000 %
    strike:      3.000000 %
    cap v alue:   2.01507
    floor value: 0
    swap value:  1.94683

.. because the  cap price is overstated.

I assume that the term structure daycounter should not have this effect on pricing results. Shouldn't it be arbitrary?

Would you please have a quick look and correct me if I am wrong.

I noticed this while building a small caplet volatility bootstrap tool that I'd like to contribute (eventually) if there is any interest.  

Many thanks for your efforts,

Roland

 

 

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[Roland Lichters]

Hi Nando,

I tried the prerelease tarball and yes, I can confirm that the bug is fixed.

Many thanks for your efforts!

Roland

---

Von: "Ferdinando Ametrano"
Gesendet: 27.07.06 18:58:15
An: "Roland Lichters"
CC: [hidden email], [hidden email]
Betreff: Re: [Quantlib-users] termstructure daycounter and put/call parity

Hi Roland

 

the bug it's been fixed on the CVS trunk. Please let me know if you still have problem

 

cia o -- Nando

 

On 7/18/06, Roland Lichters <[hidden email]> wrote:

Hello all,

the QuantLib test-suite (capfloor.cpp) checks that the put/call parity (capNPV - floorNPV = swapNPV) holds. It seems to me that this test is passed successfully only as long as one chooses  term structure daycount Actual360(), see function setup() in capfloor.cpp.

After setting this to e.g. ActualActual(ActualActual::ISDA) and keeping anything else unchanged, the test suite fails with the following messages ..

Running 236 test cases...
capfloor.cpp(283): fatal error in "CapFloorTest::testParity": put/call parity violated:
    leng th:      1 years
    volatility:  1.000000 %
    strike:      3.000000 %
    cap v alue:   2.01507
    floor value: 0
    swap value:  1.94683

.. because the  cap price is overstated.

I assume that the term structure daycounter should not have this effect on pricing results. Shouldn't it be arbitrary?

Would you please have a quick look and correct me if I am wrong.

I noticed this while building a small caplet volatility bootstrap tool that I'd like to contribute (eventually) if there is any interest.  

Many thanks for your efforts,

Roland

... [show rest of quote]

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