ggdmc (version 0.2.6.2)

BuildPrior: Specifying Parameter Prior Distributions

Description

BuildPrior sets up parameter prior distributions for each model parameter. p1 and p2 refer to the first and second parameters a prior distribution.

Usage

BuildPrior(
  p1,
  p2,
  lower = rep(NA, length(p1)),
  upper = rep(NA, length(p1)),
  dists = rep("tnorm", length(p1)),
  untrans = rep("identity", length(p1)),
  types = c("tnorm", "beta", "gamma", "lnorm", "unif", "constant", "tnorm2", NA)
)

Value

a list of list

Arguments

p1

the first parameter of a distribution

p2

the second parameter of a distribution

lower

lower support (boundary)

upper

upper support (boundary)

dists

a vector of character string specifying a distribution.

untrans

whether to do log transformation. Default is not

types

available distribution types

Details

Four distribution types are implemented:

1. Normal and truncated normal, where: p1 = mean, p2 = sd. It specifies a normal distribution when bounds are set -Inf and Inf,

2. Beta, where: p1 = shape1 and p2 = shape2 (see pbeta). Note the uniform distribution is a special case of the beta with p1 and p2 = 1),

3. Gamma, where p1 = shape and p2 = scale (see pgamma). Note p2 is scale, not rate,

4. Lognormal, where p1 = meanlog and p2 = sdlog (see plnorm).