bssm (version 1.1.5)

uniform: Prior objects for bssm models

Description

These simple objects of class bssm_prior are used to construct a prior distributions for the MCMC runs of bssm package. Currently supported priors are uniform (uniform()), half-normal (halfnormal()), normal (normal()), gamma (gamma), and truncated normal distribution (tnormal()).All parameters are vectorized so for regression coefficient vector beta you can define prior for example as normal(0, 0, c(10, 20)).

Usage

uniform(init, min, max)
halfnormal(init, sd)
normal(init, mean, sd)
tnormal(init, mean, sd, min = -Inf, max = Inf)
gamma(init, shape, rate)

Arguments

init

Initial value for the parameter, used in initializing the model components and as a starting value in MCMC.

min

Lower bound of the uniform and truncated normal prior.

max

Upper bound of the uniform and truncated normal prior.

sd

Standard deviation of the (underlying i.e. non-truncated) Normal distribution.

mean

Mean of the Normal prior.

shape

Shape parameter of the Gamma prior.

rate

Rate parameter of the Gamma prior.

Value

object of class bssm_prior.

Examples

# NOT RUN {
# create uniform prior on [-1, 1] for one parameter with initial value 0.2:
uniform(0.2, -1, 1)
# two normal priors at once i.e. for coefficients beta:
normal(init = c(0.1, 2), mean = 0, sd = c(1, 2))
# }