Dear list,

I have a really simple problem:
I want to calculate intra and inter observer variability collecting 7
measures using 2 observers and 2 repetitions for each observer so I build
the following model:

mod=lmer(y~1 +(1|repetition) + (1|observer))

the y variable is continuous but is completely different for each of the 7
measures.
the table is:
               repetition
observer   1 2 3 4 5 6 7
            1 2 2 2 2 2 2 2
            2 2 2 2 2 2 2 2
but when I run the model the message I get is:
In mer_finalize(ans) : false convergence (8)

Can someone help me?

Thank you
Cristian

-- 
PhD
Cristian Pasquaretta
University of Pavia
Via Adolfo Ferrata 1,
27100 PAVIA
cristian.pasquaretta@unipv.it

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