See documentation for RAM models summary here: umxSummary.MxModel.
View documentation on the IP model subclass here: umxSummary.MxModel.IP.
View documentation on the CP model subclass here: umxSummary.MxModel.CP.
View documentation on the GxE model subclass here: umxSummary.MxModel.GxE.
View documentation on the twin model subclass here: umxSummary.MxModel.ACE.
umxSummary(model, ...)mxModel whose fit will be reported