Fix a coefficient to a known value

Specify a covariate whose coefficient should be held constant at a fixed value rather than estimated from the data. This is useful for offset variables or when you want to impose theoretical constraints. Fixed coefficients are handled efficiently by pre-computing their contribution in R before passing data to JAGS.

Usage

fix(var, value)

Arguments

var

Unquoted variable name from your data

value

Numeric value for the coefficient (e.g., 1.0 for a standard offset)

Value

A bml_fix object that can be used within vars.

See also

vars, mm, hm

Examples

if (FALSE) { # \dontrun{
# Fix a coefficient to 1.0 (standard offset)
fix(exposure, 1.0)

# Use within vars() for multiple-membership models
vars(fix(population, 0.5) + income + education)
} # }