Control how mixture components are combined — set

Fixed mixtures use known component probabilities. Sampled mixtures expose automatic p.<component> parameters for every non-reference component; the reference component receives the residual probability. Both modes draw a component during simulation. In likelihood evaluation, a supplied component label conditions on that component; an absent or NA label averages over components using their probabilities.

Usage

set_mixture(
  spec,
  mode = c("fixed", "sample"),
  weights = NULL,
  reference = NULL
)

Arguments

spec: A race_spec object.
mode: "fixed" stores probabilities in the model. "sample" makes probabilities parameters supplied to build_param_matrix().
weights: Named numeric component probabilities for fixed mixtures. If NULL, fixed mixtures use uniform component probabilities.
reference: Reference component for sampled mixtures. Its probability is one minus the sum of non-reference probabilities. Defaults to the last component added to the model.

Value

The updated race_spec.