IBM SPSS Amos 21 - page 551

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Mixture Modeling with Training Data
EClick New to create a second group.
EChange the name in the Group Name text box from Group number 2 to
PossiblyVersicolor.
EClick New to create a third group.
EChange the name in the Group Name text box from Group number 3 to
PossiblyVirginica.
EClick Close.