This function is an optional component of the loadModelInterface. It
is unnecessary for model fitting, assessment, and prediction except when used
in conjunction with the composite method (i.e., within a
loadComp model) or for models such as loadInterps for which the
MSE cannot be known without some estimation procedure.
See also
Other loadModelInterface:
getFittedModel(),
getFittingData(),
getFittingFunction(),
getMetadata(),
predictSolute(),
simulateSolute(),
summarizeModel(),
validLoadModelInterface()
Other estimateMSE:
estimateMSE.loadComp(),
estimateMSE.loadInterp()