Wiener              Demo for the 'fptdApprox' package and the Wiener diffusion process.
LogNormal           Demo for the 'fptdApprox' package and the Lognormal diffusion process.
Gompertz            Demo for the 'fptdApprox' package and a Gompertz type diffusion process.
OrnsteinUhlenbeck   Demo for the 'fptdApprox' package and the Ornstein Uhlenbeck diffusion process.
