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from analytics import ATMstrike
import pandas as pd
def run_swaption_scenarios(swaption, date_range, spread_shock, vol_shock, vol_surface,
params=["pv_black"]):
"""computes the pv of a swaption for a range of scenarios
Parameters
----------
swaption : Swaption
date_range : `pandas.Datetime.Index`
spread_shock : `np.array`
vol_shock : `np.array`
vol_surface
params : list of strings
list attributes to call on the swaption object.
"""
r = []
spread_start = swaption.index.spread
for date in date_range:
swaption.index.trade_date = date.date()
T = swaption.T
for ss in spread_shock:
spread = spread_start * (1 + ss)
swaption.index.ref = spread
swaption._update()
atm_strike = ATMstrike(swaption.index, swaption.exercise_date)
moneyness = (swaption.index.spread / atm_strike)
curr_vol = float(vol_surface.ev(T, moneyness))
for vs in vol_shock:
vol = curr_vol * (1 + vs)
swaption.sigma = vol
r.append([date, ss, vs] + [getattr(swaption, p) for p in params])
swaption.index.spread = spread_start
df = pd.DataFrame.from_records(r, columns=['date', 'spread_shock',
'vol_shock'] + params)
return df.set_index('date')
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