..
# S3 method for fmx
logLik(object, data = object@data, ...)Function logLik.fmx returns a logLik object with
an additional attribute attr(,'logl').
Function logLik.fmx returns a logLik object indicating the log-likelihood.
An additional attribute attr(,'logl') indicates the point-wise log-likelihood,
to be use in Vuong's closeness test.