Communications in Statistics: Simulation and Computation, vol.48, no.9, pp.2679-2688, 2019 (SCI-Expanded, Scopus)
In this study, a boundary functional ((Formula presented.)) are mathematically constructed for a Gaussian random walk (GRW) with positive drift β and first four moments of the functional (Formula presented.) are expressed in terms of ladder variables based on Dynkin Principle. Moreover, approximation formulas for first three moments of ladder height (Formula presented.) are proposed based on the formulas of Siegmund (1979) when β ↓0. Finally, approximation formulas for the first four moments of the boundary functional (Formula presented.) are obtained by using Siegmund formulas and meta modeling, when β ∈[0.1, 3.6].