what algorithm is used to estimate a standard mixture model w/ continuous indicators? it is EM, correct? i was just curious if it is the standard EM, because I noticed in the output it mentions "Optimization Specifications for the Quasi-Newton Algorithm" in addition to EM. Just looking for the relevent details to describe the method in a manuscript.
See the V5 UG, page 491 for a description (available on our web site). For mixtures, Mplus uses the "EMA" option, where "A" stands for acceleration. EMA combines EM steps with interspersed QN or FS steps when they are needed to speed things along.