mcp: sd_to_prec – R documentation

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sd_to_prec

Transform a prior from SD to precision.

Description

JAGS uses precision rather than SD. This function converts dnorm(4.2, 1.3) into dnorm(4.2, 1/1.3^2). It allows users to specify priors using SD and then it's transformed for the JAGS code. It works for the following distributions: dnorm|dt|dcauchy|ddexp|dlogis|dlnorm. In all of these, tau/sd is the second parameter.

Usage

sd_to_prec(prior_str)

Arguments

prior_str

String. A JAGS prior. Can be truncated, e.g. dt(3, 2, 1) T(my_var, ).

Value

A string

Author(s)

Jonas Kristoffer Lindeløv jonas@lindeloev.dk

mcp

Regression with Multiple Change Points

v0.3.0

GPL-2

Authors

Jonas Kristoffer Lindeløv [aut, cre] (<https://orcid.org/0000-0003-4565-0595>)

Initial release

2020-07-27