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Old 11-17-2014, 06:36 AM   #2
Devon Ryan
Location: Freiburg, Germany

Join Date: Jul 2011
Posts: 3,480

Your model (~ Patient + Location + Status + Location:Status) has full rank, so it should work in general. You can drop at least patient #4, since it adds nothing.

Edit: BTW, make sure that "patient" is a factor (and reset the levels if you remove patient #4).
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