Prior Inverse-Exponential

Prior induced by \(\kappa = 1 / \nu \sim \mathrm{Exp}(\lambda)\), giving \(p(\nu) = \lambda \exp(-\lambda / \nu)\nu^{-2}\) for \(\nu > 0\). Internally this prior is applied to \(\nu = \mathrm{lower} + \exp(\theta)\).

Usage

prior_inv_exponential(lambda = 1, lower = 0, target = "coef")

prior_inv_exp(lambda = 1, lower = 0, target = "coef")

Arguments

lambda

exponential rate on \(\kappa = 1/\nu\)

lower

lower shift used in \(\nu = \mathrm{lower} + \exp(\theta)\)

target

apply prior on coefficient scale (`"coef"`) or field scale (`"field"`)

Value

prior specification