PsiInvNormal (µ,λ) is a distribution with a finite lower bound, where it is zero. The Inverse Normal distribution is used to model Brownian motion and other diffusion processes. As the parameter λ tends to infinity, the Inverse Normal distribution approaches a Normal distribution.
Alternate Formulation: PsiInvNormalAlt
PsiInvNormalAlt is the PsiInvNormal distribution defined through alternative arguments. Two parameters are required and both must be chosen from the following list: two different percentiles, mean, var or scale.