QuantLib_HullWhite_FittingParameter man page

#include <ql/models/shortrate/onefactormodels/hullwhite.hpp>

Inherits TermStructureFittingParameter.

Analytical term-structure fitting parameter $ varphi(t) $.

$ varphi(t) $ is analytically defined by [ varphi(t) = f(t) + ac{1}{2}[ac{sigma(1-e^{-at})}{a}]^2, ] where $ f(t) $ is the instantaneous forward rate at $ t $.

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