Programming the statistical procedures from SAS

maximum number of levels in proc mixed?

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maximum number of levels in proc mixed?

Hi all,
How many levels can you incorporate into a multilevel model in SAS proc mixed? Can you have four, e.g. measurements over time nested within patients nested within providers nested within clinics?
Thanks for your help.
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Re: maximum number of levels in proc mixed?

Hi modeler,

Yes, you can have four levels of nested effects. I don't think there is a maximum though keep in mind that PROC MIXED uses iterative estimation algorithm and large number of levels may substantially increase the computation time.
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