void InflationCapFlooredCouponTest::testDecomposition() {
BOOST_MESSAGE("Testing collared coupon against its decomposition...");
CommonVars vars;
Real tolerance = 1e-10;
Real npvVanilla,npvCappedLeg,npvFlooredLeg,npvCollaredLeg,npvCap,npvFloor,npvCollar;
Real error;
Rate floorstrike = 0.05;
Rate capstrike = 0.10;
std::vector<Rate> caps(vars.length,capstrike);
std::vector<Rate> caps0 = std::vector<Rate>();
std::vector<Rate> floors(vars.length,floorstrike);
std::vector<Rate> floors0 = std::vector<Rate>();
Rate gearing_p = Rate(0.5);
Spread spread_p = Spread(0.002);
Rate gearing_n = Rate(-1.5);
Spread spread_n = Spread(0.12);
// fixed leg with zero rate
Leg fixedLeg =
vars.makeFixedLeg(vars.startDate,vars.length);
// floating leg with gearing=1 and spread=0
Leg floatLeg =
vars.makeYoYLeg(vars.startDate,vars.length);
// floating leg with positive gearing (gearing_p) and spread<>0
Leg floatLeg_p =
vars.makeYoYLeg(vars.startDate,vars.length,gearing_p,spread_p);
// floating leg with negative gearing (gearing_n) and spread<>0
Leg floatLeg_n =
vars.makeYoYLeg(vars.startDate,vars.length,gearing_n,spread_n);
// Swap with null fixed leg and floating leg with gearing=1 and spread=0
Swap vanillaLeg(fixedLeg,floatLeg);
// Swap with null fixed leg and floating leg with positive gearing and spread<>0
Swap vanillaLeg_p(fixedLeg,floatLeg_p);
// Swap with null fixed leg and floating leg with negative gearing and spread<>0
Swap vanillaLeg_n(fixedLeg,floatLeg_n);
boost::shared_ptr<PricingEngine> engine(
new DiscountingSwapEngine(vars.nominalTS));
vanillaLeg.setPricingEngine(engine); // here use the autoset feature
vanillaLeg_p.setPricingEngine(engine);
vanillaLeg_n.setPricingEngine(engine);
// CAPPED coupon - Decomposition of payoff
// Payoff = Nom * Min(rate,strike) * accrualperiod =
// = Nom * [rate + Min(0,strike-rate)] * accrualperiod =
// = Nom * rate * accrualperiod - Nom * Max(rate-strike,0) * accrualperiod =
// = VanillaFloatingLeg - Call
//
Size whichPricer = 0;
// Case gearing = 1 and spread = 0
Leg cappedLeg =
vars.makeYoYCapFlooredLeg(whichPricer,vars.startDate,vars.length,
caps,floors0,vars.volatility);
Swap capLeg(fixedLeg,cappedLeg);
capLeg.setPricingEngine(engine);
YoYInflationCap cap(floatLeg, std::vector<Rate>(1, capstrike));
cap.setPricingEngine(vars.makeEngine(vars.volatility,whichPricer));
npvVanilla = vanillaLeg.NPV();
npvCappedLeg = capLeg.NPV();
npvCap = cap.NPV();
error = std::abs(npvCappedLeg - (npvVanilla-npvCap));
if (error>tolerance) {
BOOST_ERROR("\nYoY Capped Leg: gearing=1, spread=0%, strike=" << capstrike*100 <<
"%\n" <<
" Capped Floating Leg NPV: " << npvCappedLeg << "\n" <<
" Floating Leg NPV - Cap NPV: " << npvVanilla - npvCap << "\n" <<
" Diff: " << error );
}
// gearing = 1 and spread = 0
// FLOORED coupon - Decomposition of payoff
// Payoff = Nom * Max(rate,strike) * accrualperiod =
// = Nom * [rate + Max(0,strike-rate)] * accrualperiod =
// = Nom * rate * accrualperiod + Nom * Max(strike-rate,0) * accrualperiod =
// = VanillaFloatingLeg + Put
//
Leg flooredLeg =
vars.makeYoYCapFlooredLeg(whichPricer,vars.startDate,vars.length,
caps0,floors,vars.volatility);
Swap floorLeg(fixedLeg,flooredLeg);
floorLeg.setPricingEngine(engine);
YoYInflationFloor floor(floatLeg, std::vector<Rate>(1, floorstrike));
floor.setPricingEngine(vars.makeEngine(vars.volatility,whichPricer));
npvFlooredLeg = floorLeg.NPV();
npvFloor = floor.NPV();
error = std::abs(npvFlooredLeg-(npvVanilla + npvFloor));
if (error>tolerance) {
BOOST_ERROR("YoY Floored Leg: gearing=1, spread=0%, strike=" << floorstrike *100 <<
"%\n" <<
" Floored Floating Leg NPV: " << npvFlooredLeg << "\n" <<
" Floating Leg NPV + Floor NPV: " << npvVanilla + npvFloor << "\n" <<
" Diff: " << error );
}
// gearing = 1 and spread = 0
// COLLARED coupon - Decomposition of payoff
// Payoff = Nom * Min(strikem,Max(rate,strikeM)) * accrualperiod =
// = VanillaFloatingLeg - Collar
//
Leg collaredLeg =
vars.makeYoYCapFlooredLeg(whichPricer,vars.startDate,vars.length,
caps,floors,vars.volatility);
Swap collarLeg(fixedLeg,collaredLeg);
collarLeg.setPricingEngine(engine);
YoYInflationCollar collar(floatLeg,
std::vector<Rate>(1, capstrike),
std::vector<Rate>(1, floorstrike));
collar.setPricingEngine(vars.makeEngine(vars.volatility,whichPricer));
npvCollaredLeg = collarLeg.NPV();
npvCollar = collar.NPV();
error = std::abs(npvCollaredLeg -(npvVanilla - npvCollar));
if (error>tolerance) {
BOOST_ERROR("\nYoY Collared Leg: gearing=1, spread=0%, strike=" <<
floorstrike*100 << "% and " << capstrike*100 << "%\n" <<
" Collared Floating Leg NPV: " << npvCollaredLeg << "\n" <<
" Floating Leg NPV - Collar NPV: " << npvVanilla - npvCollar << "\n" <<
" Diff: " << error );
}
// gearing = a and spread = b
// CAPPED coupon - Decomposition of payoff
// Payoff
// = Nom * Min(a*rate+b,strike) * accrualperiod =
// = Nom * [a*rate+b + Min(0,strike-a*rate-b)] * accrualperiod =
// = Nom * a*rate+b * accrualperiod + Nom * Min(strike-b-a*rate,0) * accrualperiod
// --> If a>0 (assuming positive effective strike):
// Payoff = VanillaFloatingLeg - Call(a*rate+b,strike)
// --> If a<0 (assuming positive effective strike):
// Payoff = VanillaFloatingLeg + Nom * Min(strike-b+|a|*rate+,0) * accrualperiod =
// = VanillaFloatingLeg + Put(|a|*rate+b,strike)
//
// Positive gearing
Leg cappedLeg_p =
vars.makeYoYCapFlooredLeg(whichPricer,vars.startDate,vars.length,caps,floors0,
vars.volatility,gearing_p,spread_p);
Swap capLeg_p(fixedLeg,cappedLeg_p);
capLeg_p.setPricingEngine(engine);
YoYInflationCap cap_p(floatLeg_p,std::vector<Rate>(1,capstrike));
cap_p.setPricingEngine(vars.makeEngine(vars.volatility,whichPricer));
npvVanilla = vanillaLeg_p.NPV();
npvCappedLeg = capLeg_p.NPV();
npvCap = cap_p.NPV();
error = std::abs(npvCappedLeg - (npvVanilla-npvCap));
if (error>tolerance) {
BOOST_ERROR("\nYoY Capped Leg: gearing=" << gearing_p << ", " <<
"spread= " << spread_p *100 <<
"%, strike=" << capstrike*100 << "%, " <<
"effective strike= " << (capstrike-spread_p)/gearing_p*100 <<
"%\n" <<
" Capped Floating Leg NPV: " << npvCappedLeg << "\n" <<
" Vanilla Leg NPV: " << npvVanilla << "\n" <<
" Cap NPV: " << npvCap << "\n" <<
" Floating Leg NPV - Cap NPV: " << npvVanilla - npvCap << "\n" <<
" Diff: " << error );
}
// Negative gearing
Leg cappedLeg_n =
vars.makeYoYCapFlooredLeg(whichPricer,vars.startDate,vars.length,caps,floors0,
vars.volatility,gearing_n,spread_n);
Swap capLeg_n(fixedLeg,cappedLeg_n);
capLeg_n.setPricingEngine(engine);
YoYInflationFloor floor_n(floatLeg,std::vector<Rate>(1,(capstrike-spread_n)/gearing_n));
floor_n.setPricingEngine(vars.makeEngine(vars.volatility,whichPricer));
npvVanilla = vanillaLeg_n.NPV();
npvCappedLeg = capLeg_n.NPV();
npvFloor = floor_n.NPV();
error = std::abs(npvCappedLeg - (npvVanilla+ gearing_n*npvFloor));
if (error>tolerance) {
BOOST_ERROR("\nYoY Capped Leg: gearing=" << gearing_n << ", " <<
"spread= " << spread_n *100 <<
"%, strike=" << capstrike*100 << "%, " <<
"effective strike= " << (capstrike-spread_n)/gearing_n*100 <<
"%\n" <<
" Capped Floating Leg NPV: " << npvCappedLeg << "\n" <<
" npv Vanilla: " << npvVanilla << "\n" <<
" npvFloor: " << npvFloor << "\n" <<
" Floating Leg NPV - Cap NPV: " << npvVanilla + gearing_n*npvFloor << "\n" <<
" Diff: " << error );
}
// gearing = a and spread = b
// FLOORED coupon - Decomposition of payoff
// Payoff
// = Nom * Max(a*rate+b,strike) * accrualperiod =
// = Nom * [a*rate+b + Max(0,strike-a*rate-b)] * accrualperiod =
// = Nom * a*rate+b * accrualperiod + Nom * Max(strike-b-a*rate,0) * accrualperiod
// --> If a>0 (assuming positive effective strike):
// Payoff = VanillaFloatingLeg + Put(a*rate+b,strike)
// --> If a<0 (assuming positive effective strike):
// Payoff = VanillaFloatingLeg + Nom * Max(strike-b+|a|*rate+,0) * accrualperiod =
// = VanillaFloatingLeg - Call(|a|*rate+b,strike)
//
// Positive gearing
Leg flooredLeg_p1 =
vars.makeYoYCapFlooredLeg(whichPricer,vars.startDate,vars.length,caps0,floors,
vars.volatility,gearing_p,spread_p);
Swap floorLeg_p1(fixedLeg,flooredLeg_p1);
floorLeg_p1.setPricingEngine(engine);
YoYInflationFloor floor_p1(floatLeg_p,std::vector<Rate>(1,floorstrike));
floor_p1.setPricingEngine(vars.makeEngine(vars.volatility,whichPricer));
npvVanilla = vanillaLeg_p.NPV();
npvFlooredLeg = floorLeg_p1.NPV();
npvFloor = floor_p1.NPV();
error = std::abs(npvFlooredLeg - (npvVanilla+npvFloor));
if (error>tolerance) {
BOOST_ERROR("\nYoY Floored Leg: gearing=" << gearing_p << ", "
<< "spread= " << spread_p *100<< "%, strike=" << floorstrike *100 << "%, "
<< "effective strike= " << (floorstrike-spread_p)/gearing_p*100
<< "%\n" <<
" Floored Floating Leg NPV: " << npvFlooredLeg
<< "\n" <<
" Floating Leg NPV + Floor NPV: " << npvVanilla + npvFloor
<< "\n" <<
" Diff: " << error );
}
// Negative gearing
Leg flooredLeg_n =
vars.makeYoYCapFlooredLeg(whichPricer,vars.startDate,vars.length,caps0,floors,
vars.volatility,gearing_n,spread_n);
Swap floorLeg_n(fixedLeg,flooredLeg_n);
floorLeg_n.setPricingEngine(engine);
YoYInflationCap cap_n(floatLeg,std::vector<Rate>(1,(floorstrike-spread_n)/gearing_n));
cap_n.setPricingEngine(vars.makeEngine(vars.volatility,whichPricer));
npvVanilla = vanillaLeg_n.NPV();
npvFlooredLeg = floorLeg_n.NPV();
npvCap = cap_n.NPV();
error = std::abs(npvFlooredLeg - (npvVanilla - gearing_n*npvCap));
if (error>tolerance) {
BOOST_ERROR("\nYoY Capped Leg: gearing=" << gearing_n << ", " <<
"spread= " << spread_n *100 <<
"%, strike=" << floorstrike*100 << "%, " <<
"effective strike= " << (floorstrike-spread_n)/gearing_n*100 <<
"%\n" <<
" Capped Floating Leg NPV: " << npvFlooredLeg << "\n" <<
" Floating Leg NPV - Cap NPV: " << npvVanilla - gearing_n*npvCap << "\n" <<
" Diff: " << error );
}
// gearing = a and spread = b
// COLLARED coupon - Decomposition of payoff
// Payoff = Nom * Min(caprate,Max(a*rate+b,floorrate)) * accrualperiod
// --> If a>0 (assuming positive effective strike):
// Payoff = VanillaFloatingLeg - Collar(a*rate+b, floorrate, caprate)
// --> If a<0 (assuming positive effective strike):
// Payoff = VanillaFloatingLeg + Collar(|a|*rate+b, caprate, floorrate)
//
// Positive gearing
Leg collaredLeg_p =
vars.makeYoYCapFlooredLeg(whichPricer,vars.startDate,vars.length,caps,floors,
vars.volatility,gearing_p,spread_p);
Swap collarLeg_p1(fixedLeg,collaredLeg_p);
collarLeg_p1.setPricingEngine(engine);
YoYInflationCollar collar_p(floatLeg_p,
std::vector<Rate>(1,capstrike),
std::vector<Rate>(1,floorstrike));
collar_p.setPricingEngine(vars.makeEngine(vars.volatility,whichPricer));
npvVanilla = vanillaLeg_p.NPV();
npvCollaredLeg = collarLeg_p1.NPV();
npvCollar = collar_p.NPV();
error = std::abs(npvCollaredLeg - (npvVanilla - npvCollar));
if (error>tolerance) {
BOOST_ERROR("\nYoY Collared Leg: gearing=" << gearing_p << ", "
<< "spread= " << spread_p*100 << "%, strike="
<< floorstrike*100 << "% and " << capstrike*100
<< "%, "
<< "effective strike=" << (floorstrike-spread_p)/gearing_p*100
<< "% and " << (capstrike-spread_p)/gearing_p*100
<< "%\n" <<
" Collared Floating Leg NPV: " << npvCollaredLeg
<< "\n" <<
" Floating Leg NPV - Collar NPV: " << npvVanilla - npvCollar
<< "\n" <<
" Diff: " << error );
}
// Negative gearing
Leg collaredLeg_n =
vars.makeYoYCapFlooredLeg(whichPricer,vars.startDate,vars.length,caps,floors,
vars.volatility,gearing_n,spread_n);
Swap collarLeg_n1(fixedLeg,collaredLeg_n);
collarLeg_n1.setPricingEngine(engine);
YoYInflationCollar collar_n(floatLeg,
std::vector<Rate>(1,(floorstrike-spread_n)/gearing_n),
std::vector<Rate>(1,(capstrike-spread_n)/gearing_n));
collar_n.setPricingEngine(vars.makeEngine(vars.volatility,whichPricer));
npvVanilla = vanillaLeg_n.NPV();
npvCollaredLeg = collarLeg_n1.NPV();
npvCollar = collar_n.NPV();
error = std::abs(npvCollaredLeg - (npvVanilla - gearing_n*npvCollar));
if (error>tolerance) {
BOOST_ERROR("\nYoY Collared Leg: gearing=" << gearing_n << ", "
<< "spread= " << spread_n*100 << "%, strike="
<< floorstrike*100 << "% and " << capstrike*100
<< "%, "
<< "effective strike=" << (floorstrike-spread_n)/gearing_n*100
<< "% and " << (capstrike-spread_n)/gearing_n*100
<< "%\n" <<
" Collared Floating Leg NPV: " << npvCollaredLeg
<< "\n" <<
" Floating Leg NPV - Collar NPV: " << npvVanilla - gearing_n*npvCollar
<< "\n" <<
" Diff: " << error );
}
}
void CapFloorTest::testImpliedVolatility() {
BOOST_TEST_MESSAGE("Testing implied term volatility for cap and floor...");
CommonVars vars;
Size maxEvaluations = 100;
Real tolerance = 1.0e-8;
CapFloor::Type types[] = { CapFloor::Cap, CapFloor::Floor };
Rate strikes[] = { 0.02, 0.03, 0.04 };
Integer lengths[] = { 1, 5, 10 };
// test data
Rate rRates[] = { 0.02, 0.03, 0.04, 0.05, 0.06, 0.07 };
Volatility vols[] = { 0.01, 0.05, 0.10, 0.20, 0.30, 0.70, 0.90 };
for (Size k=0; k<LENGTH(lengths); k++) {
Leg leg = vars.makeLeg(vars.settlement, lengths[k]);
for (Size i=0; i<LENGTH(types); i++) {
for (Size j=0; j<LENGTH(strikes); j++) {
boost::shared_ptr<CapFloor> capfloor =
vars.makeCapFloor(types[i], leg, strikes[j], 0.0);
for (Size n=0; n<LENGTH(rRates); n++) {
for (Size m=0; m<LENGTH(vols); m++) {
Rate r = rRates[n];
Volatility v = vols[m];
vars.termStructure.linkTo(flatRate(vars.settlement,r,
Actual360()));
capfloor->setPricingEngine(vars.makeEngine(v));
Real value = capfloor->NPV();
Volatility implVol = 0.0;
try {
implVol =
capfloor->impliedVolatility(value,
vars.termStructure,
0.10,
tolerance,
maxEvaluations,
10.0e-7, 4.0, 0.0);
} catch (std::exception& e) {
// couldn't bracket?
capfloor->setPricingEngine(vars.makeEngine(0.0));
Real value2 = capfloor->NPV();
if (std::fabs(value-value2) < tolerance) {
// ok, just skip:
continue;
}
// otherwise, report error
BOOST_ERROR("implied vol failure: " <<
typeToString(types[i]) <<
"\n strike: " << io::rate(strikes[j]) <<
"\n risk-free: " << io::rate(r) <<
"\n length: " << lengths[k] << "Y" <<
"\n volatility: " << io::volatility(v) <<
"\n price: " << value <<
"\n" << e.what());
}
if (std::fabs(implVol-v) > tolerance) {
// the difference might not matter
capfloor->setPricingEngine(
vars.makeEngine(implVol));
Real value2 = capfloor->NPV();
if (std::fabs(value-value2) > tolerance) {
BOOST_FAIL("implied vol failure: " <<
typeToString(types[i]) <<
"\n strike: " << io::rate(strikes[j]) <<
"\n risk-free: " << io::rate(r) <<
"\n length: " << lengths[k] << "Y" <<
"\n volatility: " << io::volatility(v) <<
"\n price: " << value <<
"\n implied vol: " << io::volatility(implVol) <<
"\n implied price: " << value2);
}
}
}
}
}
}
}
}
void SwaptionTest::testImpliedVolatility() {
BOOST_MESSAGE("Testing implied volatility for swaptions...");
CommonVars vars;
Size maxEvaluations = 100;
Real tolerance = 1.0e-08;
Settlement::Type types[] = { Settlement::Physical, Settlement::Cash };
// test data
Rate strikes[] = { 0.02, 0.03, 0.04, 0.05, 0.06, 0.07 };
Volatility vols[] = { 0.01, 0.05, 0.10, 0.20, 0.30, 0.70, 0.90 };
for (Size i=0; i<LENGTH(exercises); i++) {
for (Size j=0; j<LENGTH(lengths); j++) {
Date exerciseDate = vars.calendar.advance(vars.today,exercises[i]);
Date startDate = vars.calendar.advance(exerciseDate,
vars.settlementDays, Days);
for (Size t=0; t<LENGTH(strikes); t++) {
for (Size k=0; k<LENGTH(type); k++) {
boost::shared_ptr<VanillaSwap> swap =
MakeVanillaSwap(lengths[j], vars.index, strikes[t])
.withEffectiveDate(startDate)
.withFloatingLegSpread(0.0)
.withType(type[k]);
for (Size h=0; h<LENGTH(types); h++) {
for (Size u=0; u<LENGTH(vols); u++) {
boost::shared_ptr<Swaption> swaption =
vars.makeSwaption(swap, exerciseDate,
vols[u], types[h]);
// Black price
Real value = swaption->NPV();
Volatility implVol = 0.0;
try {
implVol =
swaption->impliedVolatility(value,
vars.termStructure,
0.10,
tolerance,
maxEvaluations);
} catch (std::exception& e) {
// couldn't bracket?
swaption->setPricingEngine(vars.makeEngine(0.0));
Real value2 = swaption->NPV();
if (std::fabs(value-value2) < tolerance) {
// ok, just skip:
continue;
}
// otherwise, report error
BOOST_ERROR("implied vol failure: " <<
exercises[i] << "x" << lengths[j] << " " << type[k] <<
"\nsettlement: " << types[h] <<
"\nstrike " << strikes[t] <<
"\natm level: " << io::rate(swap->fairRate()) <<
"\nvol: " << io::volatility(vols[u]) <<
"\nprice: " << value <<
"\n" << e.what());
}
if (std::fabs(implVol-vols[u]) > tolerance) {
// the difference might not matter
swaption->setPricingEngine(vars.makeEngine(implVol));
Real value2 = swaption->NPV();
if (std::fabs(value-value2) > tolerance) {
BOOST_ERROR("implied vol failure: " <<
exercises[i] << "x" << lengths[j] << " " << type[k] <<
"\nsettlement: " << types[h] <<
"\nstrike " << strikes[t] <<
"\natm level: " << io::rate(swap->fairRate()) <<
"\nvol: " << io::volatility(vols[u]) <<
"\nprice: " << value <<
"\nimplied vol: " << io::volatility(implVol) <<
"\nimplied price: " << value2);
}
}
}
}
}
}
}
}
}
void CapFloorTest::testConsistency() {
BOOST_TEST_MESSAGE("Testing consistency between cap, floor and collar...");
CommonVars vars;
Integer lengths[] = { 1, 2, 3, 5, 7, 10, 15, 20 };
Rate cap_rates[] = { 0.03, 0.04, 0.05, 0.06, 0.07 };
Rate floor_rates[] = { 0.03, 0.04, 0.05, 0.06, 0.07 };
Volatility vols[] = { 0.01, 0.05, 0.10, 0.15, 0.20 };
Date startDate = vars.termStructure->referenceDate();
for (Size i=0; i<LENGTH(lengths); i++) {
for (Size j=0; j<LENGTH(cap_rates); j++) {
for (Size k=0; k<LENGTH(floor_rates); k++) {
for (Size l=0; l<LENGTH(vols); l++) {
Leg leg = vars.makeLeg(startDate,lengths[i]);
boost::shared_ptr<CapFloor> cap =
vars.makeCapFloor(CapFloor::Cap,leg,
cap_rates[j],vols[l]);
boost::shared_ptr<CapFloor> floor =
vars.makeCapFloor(CapFloor::Floor,leg,
floor_rates[k],vols[l]);
Collar collar(leg,std::vector<Rate>(1,cap_rates[j]),
std::vector<Rate>(1,floor_rates[k]));
collar.setPricingEngine(vars.makeEngine(vols[l]));
if (std::fabs((cap->NPV()-floor->NPV())-collar.NPV()) > 1e-10) {
BOOST_FAIL(
"inconsistency between cap, floor and collar:\n"
<< " length: " << lengths[i] << " years\n"
<< " volatility: " << io::volatility(vols[l]) << "\n"
<< " cap value: " << cap->NPV()
<< " at strike: " << io::rate(cap_rates[j]) << "\n"
<< " floor value: " << floor->NPV()
<< " at strike: " << io::rate(floor_rates[k]) << "\n"
<< " collar value: " << collar.NPV());
// test re-composition by optionlets, N.B. two per year
Real capletsNPV = 0.0;
std::vector<boost::shared_ptr<CapFloor> > caplets;
for (Integer m=0; m<lengths[i]*2; m++) {
caplets.push_back(cap->optionlet(m));
caplets[m]->setPricingEngine(vars.makeEngine(vols[l]));
capletsNPV += caplets[m]->NPV();
}
if (std::fabs(cap->NPV() - capletsNPV) > 1e-10) {
BOOST_FAIL(
"sum of caplet NPVs does not equal cap NPV:\n"
<< " length: " << lengths[i] << " years\n"
<< " volatility: " << io::volatility(vols[l]) << "\n"
<< " cap value: " << cap->NPV()
<< " at strike: " << io::rate(cap_rates[j]) << "\n"
<< " sum of caplets value: " << capletsNPV
<< " at strike (first): " << io::rate(caplets[0]->capRates()[0]) << "\n"
);
}
Real floorletsNPV = 0.0;
std::vector<boost::shared_ptr<CapFloor> > floorlets;
for (Integer m=0; m<lengths[i]*2; m++) {
floorlets.push_back(floor->optionlet(m));
floorlets[m]->setPricingEngine(vars.makeEngine(vols[l]));
floorletsNPV += floorlets[m]->NPV();
}
if (std::fabs(floor->NPV() - floorletsNPV) > 1e-10) {
BOOST_FAIL(
"sum of floorlet NPVs does not equal floor NPV:\n"
<< " length: " << lengths[i] << " years\n"
<< " volatility: " << io::volatility(vols[l]) << "\n"
<< " cap value: " << floor->NPV()
<< " at strike: " << io::rate(floor_rates[j]) << "\n"
<< " sum of floorlets value: " << floorletsNPV
<< " at strike (first): " << io::rate(floorlets[0]->floorRates()[0]) << "\n"
);
}
Real collarletsNPV = 0.0;
std::vector<boost::shared_ptr<CapFloor> > collarlets;
for (Integer m=0; m<lengths[i]*2; m++) {
collarlets.push_back(collar.optionlet(m));
collarlets[m]->setPricingEngine(vars.makeEngine(vols[l]));
collarletsNPV += collarlets[m]->NPV();
}
if (std::fabs(collar.NPV() - collarletsNPV) > 1e-10) {
BOOST_FAIL(
"sum of collarlet NPVs does not equal floor NPV:\n"
<< " length: " << lengths[i] << " years\n"
<< " volatility: " << io::volatility(vols[l]) << "\n"
<< " cap value: " << collar.NPV()
<< " at strike floor: " << io::rate(floor_rates[j])
<< " at strike cap: " << io::rate(cap_rates[j]) << "\n"
<< " sum of collarlets value: " << collarletsNPV
<< " at strike floor (first): " << io::rate(collarlets[0]->floorRates()[0])
<< " at strike cap (first): " << io::rate(collarlets[0]->capRates()[0]) << "\n"
);
}
}
}
}
}
}
}
void InflationCapFloorTest::testConsistency() {
BOOST_TEST_MESSAGE("Testing consistency between yoy inflation cap,"
" floor and collar...");
CommonVars vars;
Integer lengths[] = { 1, 2, 3, 5, 7, 10, 15, 20 };
Rate cap_rates[] = { 0.01, 0.025, 0.029, 0.03, 0.031, 0.035, 0.07 };
Rate floor_rates[] = { 0.01, 0.025, 0.029, 0.03, 0.031, 0.035, 0.07 };
Volatility vols[] = { 0.001, 0.005, 0.010, 0.015, 0.020 };
for (Size whichPricer = 0; whichPricer < 3; whichPricer++) {
for (Size i=0; i<LENGTH(lengths); i++) {
for (Size j=0; j<LENGTH(cap_rates); j++) {
for (Size k=0; k<LENGTH(floor_rates); k++) {
for (Size l=0; l<LENGTH(vols); l++) {
Leg leg = vars.makeYoYLeg(vars.evaluationDate,lengths[i]);
ext::shared_ptr<YoYInflationCapFloor> cap
= vars.makeYoYCapFloor(YoYInflationCapFloor::Cap,
leg, cap_rates[j], vols[l], whichPricer);
ext::shared_ptr<YoYInflationCapFloor> floor
= vars.makeYoYCapFloor(YoYInflationCapFloor::Floor,
leg, floor_rates[k], vols[l], whichPricer);
YoYInflationCollar collar(leg,std::vector<Rate>(1,cap_rates[j]),
std::vector<Rate>(1,floor_rates[k]));
collar.setPricingEngine(vars.makeEngine(vols[l], whichPricer));
if (std::fabs((cap->NPV()-floor->NPV())-collar.NPV()) > 1e-6) {
BOOST_FAIL(
"inconsistency between cap, floor and collar:\n"
<< " length: " << lengths[i] << " years\n"
<< " volatility: " << io::volatility(vols[l]) << "\n"
<< " cap value: " << cap->NPV()
<< " at strike: " << io::rate(cap_rates[j]) << "\n"
<< " floor value: " << floor->NPV()
<< " at strike: " << io::rate(floor_rates[k]) << "\n"
<< " collar value: " << collar.NPV());
// test re-composition by optionlets, N.B. ONE per year
Real capletsNPV = 0.0;
std::vector<ext::shared_ptr<YoYInflationCapFloor> > caplets;
for (Integer m=0; m<lengths[i]*1; m++) {
caplets.push_back(cap->optionlet(m));
caplets[m]->setPricingEngine(vars.makeEngine(vols[l], whichPricer));
capletsNPV += caplets[m]->NPV();
}
if (std::fabs(cap->NPV() - capletsNPV) > 1e-6) {
BOOST_FAIL(
"sum of caplet NPVs does not equal cap NPV:\n"
<< " length: " << lengths[i] << " years\n"
<< " volatility: " << io::volatility(vols[l]) << "\n"
<< " cap value: " << cap->NPV()
<< " at strike: " << io::rate(cap_rates[j]) << "\n"
<< " sum of caplets value: " << capletsNPV
<< " at strike (first): " << io::rate(caplets[0]->capRates()[0]) << "\n"
);
}
Real floorletsNPV = 0.0;
std::vector<ext::shared_ptr<YoYInflationCapFloor> > floorlets;
for (Integer m=0; m<lengths[i]*1; m++) {
floorlets.push_back(floor->optionlet(m));
floorlets[m]->setPricingEngine(vars.makeEngine(vols[l], whichPricer));
floorletsNPV += floorlets[m]->NPV();
}
if (std::fabs(floor->NPV() - floorletsNPV) > 1e-6) {
BOOST_FAIL(
"sum of floorlet NPVs does not equal floor NPV:\n"
<< " length: " << lengths[i] << " years\n"
<< " volatility: " << io::volatility(vols[l]) << "\n"
<< " cap value: " << floor->NPV()
<< " at strike: " << io::rate(floor_rates[j]) << "\n"
<< " sum of floorlets value: " << floorletsNPV
<< " at strike (first): " << io::rate(floorlets[0]->floorRates()[0]) << "\n"
);
}
Real collarletsNPV = 0.0;
std::vector<ext::shared_ptr<YoYInflationCapFloor> > collarlets;
for (Integer m=0; m<lengths[i]*1; m++) {
collarlets.push_back(collar.optionlet(m));
collarlets[m]->setPricingEngine(vars.makeEngine(vols[l], whichPricer));
collarletsNPV += collarlets[m]->NPV();
}
if (std::fabs(collar.NPV() - collarletsNPV) > 1e-6) {
BOOST_FAIL(
"sum of collarlet NPVs does not equal floor NPV:\n"
<< " length: " << lengths[i] << " years\n"
<< " volatility: " << io::volatility(vols[l]) << "\n"
<< " cap value: " << collar.NPV()
<< " at strike floor: " << io::rate(floor_rates[j])
<< " at strike cap: " << io::rate(cap_rates[j]) << "\n"
<< " sum of collarlets value: " << collarletsNPV
<< " at strike floor (first): " << io::rate(collarlets[0]->floorRates()[0])
<< " at strike cap (first): " << io::rate(collarlets[0]->capRates()[0]) << "\n"
);
}
}
}
}
}
}
} // pricer loop
// remove circular refernce
vars.hy.linkTo(ext::shared_ptr<YoYInflationTermStructure>());
}
