Blurb::
Multilevel Polynomial Chaos Expansion as an emulator model.

Description:: 
Selects a multilevel polynomial chaos expansion (ML PCE) surrogate model 
to use in the Bayesian likelihood calculations.  Most specification options are 
carried over for using ML PCE as a surrogate within the Bayesian framework.

Topics::
Examples::
Theory::
Faq::
See_Also::	method-multilevel_polynomial_chaos
