[R-sig-ME] Nested fixed factors in glmer: Error in mer_finalize(ans) : Downdated X'X is not positive definite, 1.

[PALACIO BLASCO, SARA]

Hi Hugo,

Thanks for your e-mails. The structure of my data is not the one in  
your examples but:

Factor 1: a,b,c
factor 2: 1,2,3,4,5,6

combination:
a.1, a.2, b.3, b.4, c.5, c.6

note factor 2 is nested within factor 1, so that not all levels of  
factor 2 are in every level of factor 1.
Hence I do not have a full factorial or crossed design but a hierarchical one.

My question: How can I include such a design in glmer?

Cheers,

Sara

Hugo.Mildenberger at web.de escribió:

> On Thu, 28 Feb 2013 14:27:36 +0100
> "PALACIO BLASCO, SARA" <s.palacio at ipe.csic.es> wrote:
>
>> Maybe this is a trivial question but: how can I specify a nested
>> structured of fixed factors in glmer?
>>
>> I still haven't found a way to solve the issues explained in my
>> previous e-mail.
>
>
> Sara,
>
> may be this fits your needs?
>
>> a<-factor(c('a','b','c','d'))
>> b<-factor(c('1','2'))
>> interaction(a,b)
> [1] a.1 b.2 c.1 d.2
> Levels: a.1 b.1 c.1 d.1 a.2 b.2 c.2 d.2
>
>
> Best