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我試圖在使用Quantlib(v1.2)SWIG包裝器的python中定價非常基本的浮動利率債券。我修改了文檔中包含的示例。使用Python爲quantlib中的浮動債券定價使用Python
我的債券有4年的到期日。 libor設置爲10%,債券的價差爲0.我的問題是,如果我以10%的利率貼現,爲什麼不是債券100的PV?我得到99.54的值。
謝謝!
from QuantLib import *
frequency_enum, settle_date = 4, Date(5, 1, 2010)
maturity_date = Date(5, 1, 2014)
face_amount = 100.0
settlement_days = 0
fixing_days = 0
calendar = NullCalendar()
settle_date = calendar.adjust(settle_date)
todays_date = calendar.advance(settle_date, -fixing_days, Days)
Settings.instance().evaluationDate = todays_date
rate = 10.0/100.0
flat_forward = FlatForward(settle_date,
rate,
Thirty360(),
Compounded,
frequency_enum)
discounting_term_structure = RelinkableYieldTermStructureHandle(flat_forward)
index_term_structure = RelinkableYieldTermStructureHandle(flat_forward)
index = USDLibor(Period(3, Months), index_term_structure)
schedule = Schedule(settle_date,
maturity_date, Period(frequency_enum),
NullCalendar(),
Unadjusted, Unadjusted,
DateGeneration.Forward, False)
floating_bond = FloatingRateBond(settlement_days,
face_amount,
schedule,
index,
Thirty360(),
Unadjusted,
fixing_days,
[], # Gearings
[0], # Spreads
[], # Caps
[], # Floors
False, # Fixing in arrears
face_amount,
settle_date)
bond_engine = DiscountingBondEngine(discounting_term_structure)
floating_bond.setPricingEngine(bond_engine)
# coupon pricers
pricer = BlackIborCouponPricer()
volatility = 0.0
vol = ConstantOptionletVolatility(settlement_days,
calendar,
Unadjusted,
volatility,
Thirty360())
pricer.setCapletVolatility(OptionletVolatilityStructureHandle(vol))
setCouponPricer(floating_bond.cashflows(), pricer)
print floating_bond.NPV(), floating_bond.cleanPrice(), floating_bond.dirtyPrice()
非常感謝。我創建了一個自定義索引,我得到了100.0的確切結果!自定義索引是:'index = IborIndex('USD Libor',Period(3,Months),settlement_days,USDCurrency(),NullCalendar(),Unadjusted,False,Thirty360(),index_term_structure)' – ducky 2013-03-08 20:52:56