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Hi, Can you send us a screenshot of the output of the Efficiency button in the GLM GUI? I cannot see why you would have a rank deficient design given your description, but this will show you where there are strong correlations. All the best, Mark On 8 May 2013, at 19:58, R.P. Hylkema <[log in to unmask]> wrote: > Hi Wolf, > > Thx for your reply. Unfortunately, your advice didn't solve the problem. I still get the rank deficiency error. > > Any other ideas? > > greetz, > Ruben