mafipy.function.black_payers_swaption_volga¶
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mafipy.function.
black_payers_swaption_volga
(init_swap_rate, option_strike, swap_annuity, option_maturity, vol)[source]¶ calculates volga of payer’s swaption under black model.
Parameters: - init_swap_rate (float) – initial swap rate.
- option_strike (float) – swaption strike.
- swap_annuity (float) – annuity of referencing swap
- option_maturity (float) – swaption maturity.
- vol (float) – volatilty. this must be positive.
Returns: volga.
Return type: float.
Raises: AssertionError – if volatility is not positive.