Re: [R] lme4 problem: model defining and effect estimation ------ question from new bird to R community from SAS community

From: peter dalgaard <>
Date: Sat, 16 Apr 2011 11:25:27 +0200

On Apr 16, 2011, at 09:52 , Dieter Menne wrote:


> Thanks for providing a self-contained example. The error message is really a
> bit confusing (anybody around who understands what lme thinks here?),

It's not thinking at all, it's just evaluating a:b (so usual model formula interpretation is partially disabled? Hm, well, multiplying the two continuous variables wouldn't make sense either, I suppose.) and what you see is a variant of

> (1:2):(1:2)

[1] 1
Warning messages:
1: In (1:2):(1:2) :
  numerical expression has 2 elements: only the first used 2: In (1:2):(1:2) :
  numerical expression has 2 elements: only the first used

Peter Dalgaard
Center for Statistics, Copenhagen Business School
Solbjerg Plads 3, 2000 Frederiksberg, Denmark
Phone: (+45)38153501
Email:  Priv:

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