theta {CNPBayes} | R Documentation

## Accessor for the theta parameter in the hierarchical mixture model

### Description

The interpretation of `theta` depends on whether `object` is a `MarginalModel` or a `BatchModel`. For `BatchModel`, `theta` is a matrix of size B x K, where B is the number of batches and K is the number of components. Each column of the `theta` matrix can be interpreted as the batch means for a particular component. For objects of class `MarginalModel` (assumes no batch effect), `theta` is a vector of length K. Each element of `theta` can be interpreted as the mean for a component. See the following examples for accessing the current value of `theta` from a `MixtureModel`-derived object, and for plotting the chain of `theta` values.

### Usage

    theta(object)

    ## S4 method for signature 'McmcChains'
    theta(object)

    ## S4 method for signature 'MixtureModel'
    theta(object)

### Arguments

`object` | see `showMethods(theta)`

### Value

A vector of length number of components or a matrix of size number of batches x number of components

### Examples

    ## MarginalModel
    ## Not run:
    k(SingleBatchModelExample)
    theta(SingleBatchModelExample)
    plot.ts(theta(chains(SingleBatchModelExample)))
    ## BatchModel
    k(MultiBatchModelExample)
    length(unique(batch(MultiBatchModelExample)))
    theta(MultiBatchModelExample)
    ## Plot means for batches in one component
    plot.ts(theta(chains(MultiBatchModelExample))[, 1:3])

    ## End(Not run)

[Package CNPBayes version 1.12.0 Index]