log_lik: Generic function for pointwise log-likelihood
Description
We define a new function log_lik() rather than a
stats::logLik() method because (in addition to the conceptual
difference) the documentation for logLik() states that the return value
will be a single number, whereas log_lik() returns a matrix. See
the log_lik.stanreg()
method in the rstanarm package for an example of defining a method.
Usage
log_lik(object, ...)
Arguments
object
The object to use.
...
Arguments passed to methods. See the methods in the rstanarm
package for examples.
Value
log_lik() methods should return a \(S\) by \(N\) matrix,
where \(S\) is the size of the posterior sample (the number of draws from
the posterior distribution) and \(N\) is the number of data points.
Guidelines and recommendations for developers of R packages
interfacing with Stan and a demonstration getting a simple package working
can be found in the vignettes included with rstantools and at
mc-stan.org/rstantools/articles.