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You're question is answered by a scan of the examples at the end of -help mixed-. What determines the level is based on position and syntax.
Code:* A two-level model, with a random effect for level2_id mixed y fe_equation || level2_id : * A three-level model, with random effects for level2_id nested within a level3_id mixed y fe_equation || level3_id : || level2_id : * Two-way crossed random effects mixed weight week || _all: R.id || _all: R.week
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