This video explains the different models in SEM. The video discusses measurement models, path models, and full structural models. Additionally, a discussion is had on types of mediation models along with higher order models.
If you are looking for more information about structural equation modeling, see my book titled, Applied Structural Equation Modeling using AMOS. The book can be purchased at:
Amazon:
https://www.amazon.com/AppliedStruct
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and
Barnes and Noble:
https://www.barnesandnoble.com/w/appl