//-------------------------------------------------------------------------
public virtual void test_presentValueSensitivity()
{
for (int i = 0; i < NB_STRIKES; ++i)
{
ResolvedFxVanillaOption option = CALLS[i];
PointSensitivityBuilder point = PRICER.presentValueSensitivityRatesStickyStrike(option, RATES_PROVIDER, VOLS);
CurrencyParameterSensitivities sensiComputed = RATES_PROVIDER.parameterSensitivity(point.build());
double timeToExpiry = VOLS.relativeTime(EXPIRY);
double forwardRate = FX_PRICER.forwardFxRate(UNDERLYING[i], RATES_PROVIDER).fxRate(CURRENCY_PAIR);
double strikeRate = option.Strike;
SmileDeltaParameters smileAtTime = VOLS.Smile.smileForExpiry(timeToExpiry);
double[] vols = smileAtTime.Volatility.toArray();
double df = RATES_PROVIDER.discountFactor(USD, PAY);
CurrencyParameterSensitivities sensiExpected = FD_CAL.sensitivity(RATES_PROVIDER, p => PRICER.presentValue(option, p, VOLS));
CurrencyParameterSensitivities sensiRes = FD_CAL.sensitivity(RATES_PROVIDER, (ImmutableRatesProvider p) =>
{
double fwd = FX_PRICER.forwardFxRate(option.Underlying, p).fxRate(CURRENCY_PAIR);
double[] strs = smileAtTime.strike(fwd).toArray();
double[] wghts = weights(fwd, strikeRate, strs, timeToExpiry, vols[1]);
double res = 0d;
for (int j = 0; j < 3; ++j)
{
res += wghts[j] * (BlackFormulaRepository.price(forwardRate, strs[j], timeToExpiry, vols[j], true) - BlackFormulaRepository.price(forwardRate, strs[j], timeToExpiry, vols[1], true));
}
return(CurrencyAmount.of(USD, -res * df * NOTIONAL));
});
assertTrue(sensiComputed.equalWithTolerance(sensiExpected.combinedWith(sensiRes), FD_EPS * NOTIONAL * 10d));
}
}
// computes sensitivity with finite difference approximation
private CurrencyParameterSensitivities fdSensitivityWithZSpread(CapitalIndexedBondPaymentPeriod period, ImmutableRatesProvider ratesProvider, LegalEntityDiscountingProvider issuerRatesProvider, double zSpread, CompoundedRateType compoundedRateType, int periodsPerYear)
{
CurrencyParameterSensitivities sensi1 = FD_CAL.sensitivity(issuerRatesProvider, p => CurrencyAmount.of(USD, PRICER.presentValueWithZSpread(period, ratesProvider, p.issuerCurveDiscountFactors(CapitalIndexedBondCurveDataSet.IssuerId, USD), zSpread, compoundedRateType, periodsPerYear)));
CurrencyParameterSensitivities sensi2 = FD_CAL.sensitivity(ratesProvider, p => CurrencyAmount.of(USD, PRICER.presentValueWithZSpread(period, p, issuerRatesProvider.issuerCurveDiscountFactors(CapitalIndexedBondCurveDataSet.IssuerId, USD), zSpread, compoundedRateType, periodsPerYear)));
return(sensi1.combinedWith(sensi2));
}
public virtual void test_presentValueSensitivity()
{
PointSensitivities point = PRICER.presentValueSensitivity(FWD, PROVIDER);
CurrencyParameterSensitivities computed = PROVIDER.parameterSensitivity(point);
CurrencyParameterSensitivities expectedUsd = CAL_FD.sensitivity(PROVIDER, (p) => PRICER.presentValue(FWD, (p)).getAmount(USD));
CurrencyParameterSensitivities expectedKrw = CAL_FD.sensitivity(PROVIDER, (p) => PRICER.presentValue(FWD, (p)).getAmount(KRW));
assertTrue(computed.equalWithTolerance(expectedUsd.combinedWith(expectedKrw), NOMINAL_USD * FX_RATE * EPS_FD));
}
//-------------------------------------------------------------------------
/// <summary>
/// Calculates the present value sensitivity of the FX barrier option trade.
/// <para>
/// The present value sensitivity of the trade is the sensitivity of the present value to
/// the underlying curves.
/// </para>
/// <para>
/// The sensitivity is computed by bump and re-price, returning <seealso cref="CurrencyParameterSensitivities"/>,
/// not <seealso cref="PointSensitivities"/>.
/// </para>
/// <para>
/// The trinomial tree is first calibrated to Black volatilities,
/// then the price is computed based on the calibrated tree.
///
/// </para>
/// </summary>
/// <param name="trade"> the option trade </param>
/// <param name="ratesProvider"> the rates provider </param>
/// <param name="volatilities"> the Black volatility provider </param>
/// <returns> the present value curve sensitivity of the trade </returns>
public virtual CurrencyParameterSensitivities presentValueSensitivityRates(ResolvedFxSingleBarrierOptionTrade trade, RatesProvider ratesProvider, BlackFxOptionVolatilities volatilities)
{
ResolvedFxSingleBarrierOption product = trade.Product;
CurrencyParameterSensitivities sensProduct = productPricer.presentValueSensitivityRates(product, ratesProvider, volatilities);
Payment premium = trade.Premium;
PointSensitivityBuilder pvcsPremium = paymentPricer.presentValueSensitivity(premium, ratesProvider);
CurrencyParameterSensitivities sensPremium = ratesProvider.parameterSensitivity(pvcsPremium.build());
return(sensProduct.combinedWith(sensPremium));
}
public virtual void test_presentValueSensitivity_started()
{
ResolvedFxSwap product = ResolvedFxSwap.ofForwardPoints(CurrencyAmount.of(USD, NOMINAL_USD), KRW, FX_RATE, FX_FWD_POINTS, PAYMENT_DATE_PAST, PAYMENT_DATE_NEAR);
PointSensitivities point = PRICER.presentValueSensitivity(product, PROVIDER);
CurrencyParameterSensitivities computed = PROVIDER.parameterSensitivity(point);
CurrencyParameterSensitivities expectedUsd = CAL_FD.sensitivity(PROVIDER, (p) => PRICER.presentValue(product, (p)).getAmount(USD));
CurrencyParameterSensitivities expectedKrw = CAL_FD.sensitivity(PROVIDER, (p) => PRICER.presentValue(product, (p)).getAmount(KRW));
assertTrue(computed.equalWithTolerance(expectedUsd.combinedWith(expectedKrw), NOMINAL_USD * FX_RATE * EPS_FD));
}
public virtual void test_presentValueSensitivity_position()
{
PointSensitivities point = PRICER.presentValueSensitivity(POSITION, RATES_PROVIDER, ISSUER_RATES_PROVIDER);
CurrencyParameterSensitivities computed = ISSUER_RATES_PROVIDER.parameterSensitivity(point).combinedWith(RATES_PROVIDER.parameterSensitivity(point));
CurrencyParameterSensitivities fdRates = FD_CAL.sensitivity(RATES_PROVIDER, p => PRICER.presentValue(POSITION, p, ISSUER_RATES_PROVIDER));
CurrencyParameterSensitivities fdPrice = FD_CAL.sensitivity(ISSUER_RATES_PROVIDER, p => PRICER.presentValue(POSITION, RATES_PROVIDER, p));
CurrencyParameterSensitivities expected = fdRates.combinedWith(fdPrice);
assertTrue(computed.equalWithTolerance(expected, NOTIONAL * QUANTITY * EPS));
}
public virtual void test_presentValueSensitivityWithZSpread_afterFix()
{
PointSensitivityBuilder pointInterp = PRICER.presentValueSensitivityWithZSpread(PERIOD_INTERP, IRP_AFTER_FIX, ICDF_AFTER_FIX, Z_SPREAD, PERIODIC, PERIOD_PER_YEAR);
CurrencyParameterSensitivities computedInterp1 = LEDP_AFTER_FIX.parameterSensitivity(pointInterp.build());
CurrencyParameterSensitivities computedInterp2 = IRP_AFTER_FIX.parameterSensitivity(pointInterp.build());
PointSensitivityBuilder pointMonthly = PRICER.presentValueSensitivityWithZSpread(PERIOD_MONTHLY, IRP_AFTER_FIX, ICDF_AFTER_FIX, Z_SPREAD, CONTINUOUS, 0);
CurrencyParameterSensitivities computedMonthly1 = LEDP_AFTER_FIX.parameterSensitivity(pointMonthly.build());
CurrencyParameterSensitivities computedMonthly2 = IRP_AFTER_FIX.parameterSensitivity(pointMonthly.build());
CurrencyParameterSensitivities expectedInterp = fdSensitivityWithZSpread(PERIOD_INTERP, IRP_AFTER_FIX, LEDP_AFTER_FIX, Z_SPREAD, PERIODIC, PERIOD_PER_YEAR);
CurrencyParameterSensitivities expectedMonthly = fdSensitivityWithZSpread(PERIOD_MONTHLY, IRP_AFTER_FIX, LEDP_AFTER_FIX, Z_SPREAD, CONTINUOUS, 0);
assertTrue(computedInterp1.combinedWith(computedInterp2).equalWithTolerance(expectedInterp, NOTIONAL * FD_EPS));
assertTrue(computedMonthly1.combinedWith(computedMonthly2).equalWithTolerance(expectedMonthly, NOTIONAL * FD_EPS));
}
public virtual void test_presentValueSensitivity_onFix()
{
PointSensitivityBuilder pointInterp = PRICER.presentValueSensitivity(PERIOD_INTERP, IRP_ON_FIX, ICDF_ON_FIX);
CurrencyParameterSensitivities computedInterp1 = LEDP_ON_FIX.parameterSensitivity(pointInterp.build());
CurrencyParameterSensitivities computedInterp2 = IRP_ON_FIX.parameterSensitivity(pointInterp.build());
PointSensitivityBuilder pointMonthly = PRICER.presentValueSensitivity(PERIOD_MONTHLY, IRP_ON_FIX, ICDF_ON_FIX);
CurrencyParameterSensitivities computedMonthly1 = LEDP_ON_FIX.parameterSensitivity(pointMonthly.build());
CurrencyParameterSensitivities computedMonthly2 = IRP_ON_FIX.parameterSensitivity(pointMonthly.build());
CurrencyParameterSensitivities expectedInterp = fdSensitivity(PERIOD_INTERP, IRP_ON_FIX, LEDP_ON_FIX);
CurrencyParameterSensitivities expectedMonthly = fdSensitivity(PERIOD_MONTHLY, IRP_ON_FIX, LEDP_ON_FIX);
assertTrue(computedInterp1.combinedWith(computedInterp2).equalWithTolerance(expectedInterp, NOTIONAL * FD_EPS));
assertTrue(computedMonthly1.combinedWith(computedMonthly2).equalWithTolerance(expectedMonthly, NOTIONAL * FD_EPS));
}
public virtual void test_presentValueSensitivityModelParamsVolatility_after()
{
PointSensitivityBuilder capComputed = PRICER.presentValueSensitivityModelParamsVolatility(CAP, RATES_AFTER, VOLS_AFTER);
PointSensitivityBuilder floorComputed = PRICER.presentValueSensitivityModelParamsVolatility(FLOOR, RATES_AFTER, VOLS_AFTER);
CurrencyParameterSensitivities capExpected = CurrencyParameterSensitivities.empty();
CurrencyParameterSensitivities floorExpected = CurrencyParameterSensitivities.empty();
int nPeriods = CAP.CapletFloorletPeriods.size();
for (int i = 3; i < nPeriods; ++i)
{
capExpected = capExpected.combinedWith(VOLS_AFTER.parameterSensitivity(PRICER_PERIOD.presentValueSensitivityModelParamsVolatility(CAP.CapletFloorletPeriods.get(i), RATES_AFTER, VOLS_AFTER).build()));
floorExpected = floorExpected.combinedWith(VOLS_AFTER.parameterSensitivity(PRICER_PERIOD.presentValueSensitivityModelParamsVolatility(FLOOR.CapletFloorletPeriods.get(i), RATES_AFTER, VOLS_AFTER).build()));
}
CurrencyParameterSensitivities capSensiComputed = VOLS_AFTER.parameterSensitivity(capComputed.build());
CurrencyParameterSensitivities floorSensiComputed = VOLS_AFTER.parameterSensitivity(floorComputed.build());
assertTrue(capSensiComputed.equalWithTolerance(capExpected, TOL * NOTIONAL_VALUE));
assertTrue(floorSensiComputed.equalWithTolerance(floorExpected, TOL * NOTIONAL_VALUE));
}
//-------------------------------------------------------------------------
public virtual void test_presentValueSensitivityVolatility()
{
PointSensitivityBuilder capComputed = PRICER.presentValueSensitivityModelParamsVolatility(CAP, RATES, VOLS);
PointSensitivityBuilder floorComputed = PRICER.presentValueSensitivityModelParamsVolatility(FLOOR, RATES, VOLS);
CurrencyParameterSensitivities capExpected = CurrencyParameterSensitivities.empty();
CurrencyParameterSensitivities floorExpected = CurrencyParameterSensitivities.empty();
int nPeriods = CAP.CapletFloorletPeriods.size();
for (int i = 0; i < nPeriods; ++i)
{
capExpected = capExpected.combinedWith(VOLS.parameterSensitivity(PRICER_PERIOD.presentValueSensitivityModelParamsVolatility(CAP.CapletFloorletPeriods.get(i), RATES, VOLS).build()));
floorExpected = floorExpected.combinedWith(VOLS.parameterSensitivity(PRICER_PERIOD.presentValueSensitivityModelParamsVolatility(FLOOR.CapletFloorletPeriods.get(i), RATES, VOLS).build()));
}
CurrencyParameterSensitivities capSensiComputed = VOLS.parameterSensitivity(capComputed.build());
CurrencyParameterSensitivities floorSensiComputed = VOLS.parameterSensitivity(floorComputed.build());
CurrencyParameterSensitivity capSensiExpected = capExpected.Sensitivities.get(0);
CurrencyParameterSensitivity floorSensiExpected = floorExpected.Sensitivities.get(0);
assertTrue(DoubleArrayMath.fuzzyEquals(capSensiComputed.Sensitivities.get(0).Sensitivity.toArray(), capSensiExpected.Sensitivity.toArray(), TOL * NOTIONAL_VALUE));
assertTrue(DoubleArrayMath.fuzzyEquals(floorSensiComputed.Sensitivities.get(0).Sensitivity.toArray(), floorSensiExpected.Sensitivity.toArray(), TOL * NOTIONAL_VALUE));
}
//-------------------------------------------------------------------------
public virtual void test_presentValueSensitivity()
{
// call
PointSensitivities pointCall = PRICER.presentValueSensitivityRatesStickyStrike(CALL_OTM, RATES_PROVIDER, VOLS);
CurrencyParameterSensitivities computedCall = RATES_PROVIDER.parameterSensitivity(pointCall);
CurrencyParameterSensitivities expectedCall = FD_CAL.sensitivity(RATES_PROVIDER, (p) => PRICER.presentValue(CALL_OTM, (p), VOLS));
// contribution via implied volatility, to be subtracted.
CurrencyAmount pvVegaCall = PRICER.presentValueVega(CALL_OTM, RATES_PROVIDER, VOLS);
CurrencyParameterSensitivities impliedVolSenseCall = FD_CAL.sensitivity(RATES_PROVIDER, (p) => CurrencyAmount.of(USD, PRICER.impliedVolatility(CALL_OTM, (p), VOLS))).multipliedBy(-pvVegaCall.Amount);
assertTrue(computedCall.equalWithTolerance(expectedCall.combinedWith(impliedVolSenseCall), NOTIONAL * FD_EPS));
// put
PointSensitivities pointPut = PRICER.presentValueSensitivityRatesStickyStrike(PUT_OTM, RATES_PROVIDER, VOLS);
CurrencyParameterSensitivities computedPut = RATES_PROVIDER.parameterSensitivity(pointPut);
CurrencyParameterSensitivities expectedPut = FD_CAL.sensitivity(RATES_PROVIDER, (p) => PRICER.presentValue(PUT_OTM, (p), VOLS));
// contribution via implied volatility, to be subtracted.
CurrencyAmount pvVegaPut = PRICER.presentValueVega(PUT_OTM, RATES_PROVIDER, VOLS);
CurrencyParameterSensitivities impliedVolSensePut = FD_CAL.sensitivity(RATES_PROVIDER, (p) => CurrencyAmount.of(USD, PRICER.impliedVolatility(PUT_OTM, (p), VOLS))).multipliedBy(-pvVegaPut.Amount);
assertTrue(computedPut.equalWithTolerance(expectedPut.combinedWith(impliedVolSensePut), NOTIONAL * FD_EPS));
}
