Use of nesting in lmer- error in numerical expression

Dear R users,



I am trying to fit a GLMM using lmer to a dataset where the brood identity
(LNRREIR) is nested within mothers identity. The reason for this is that
each mother can have several nests within each year and also between years.



I am running the following script (actually I have tried all different
combinations with LNRREIR and mother):



mod <- lmer(sr~z.hatchday  + (1|LNRREIR:mother) + (1|mother),
family=binomial, data=aggrsexfil)

Error in LNRREIR:mother : result would be too long a vector

In addition: Warning messages:

1: numerical expression has 64 elements: only the first used in:
LNRREIR:mother

2: numerical expression has 64 elements: only the first used in:
LNRREIR:mother



Is this the wrong way to specify it or what is happening here?



I am also wondering if only including mother as a random factor, do R
understand that its nested? That is, when there are e.g. 60 different nests
and 40 mothers. Do R then take into account that each mother can have
multiple broods? In that way the nesting seems redundant..?

Thanks for all help!



Best regards,



Arild





--------------------------------------------

Arild Husby (M.Sc.),

Research Technician,

Department of Biology,

Realfagbygget,

Norwegian University of Science and Technology,

N-7491 Trondheim

NORWAY

e-mail:  <mailto:arildhus at stud.ntnu.no> arildhus at stud.ntnu.no

mobile: +47 92294412

office : +47 73596266




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