prior_spike_and_slab: Creates a spike and slab prior distribution

In BayesTools: Tools for Bayesian Analyses

Creates a spike and slab prior distribution

Description

prior_spike_and_slab creates a spike and slab prior distribution corresponding to the specification in \insertCitekuo1998variable;textualBayesTools (see \insertCiteohara2009review;textualBayesTools for further details). I.e., a prior distribution is multiplied by an independent indicator with values either zero or one.

Usage

prior_spike_and_slab(
  prior_parameter,
  prior_inclusion = prior(distribution = "spike", parameters = list(location = 0.5)),
  prior_weights = 1
)

Arguments

prior_parameter	a prior distribution for the parameter
prior_inclusion	a prior distribution for the inclusion probability. The inclusion probability must be bounded within 0 and 1 range. Defaults to prior("spike", parameters = list(location = 0.5)) which corresponds to 1/2 prior probability of including the slab prior distribution (but other prior distributions, like beta etc can be also specified).
prior_weights	prior odds associated with a given distribution. The value is passed into the model fitting function, which creates models corresponding to all combinations of prior distributions for each of the model parameters and sets the model priors odds to the product of its prior distributions.

Value

return an object of class 'prior'.

See Also

prior()

Examples

# create a spike and slab prior distribution
p1 <- prior_spike_and_slab(
   prior(distribution = "normal", parameters = list(mean = 0, sd = 1)),
   prior_inclusion = prior(distribution = "beta", parameters = list(alpha = 1, beta = 1))
)

BayesTools documentation built on July 26, 2023, 5:37 p.m.