[R-sig-ME] Observation-level random effects

[Shahinur, Islam]

Hello All,
I am having trouble with observation-level random effects while running the
full model investigating two fixed covariates (one categorical and one
continuous) and two random covariates (tank and family). While I am using
the only tank random effect, it works fine, but while I am adding another
random covariate (family), I am getting the error message: Error: number of
levels of each grouping factor must be < number of observations (problems:
family).

FYI, here is my code:
model1 <- lmer(development~ 1 +cross + egg +cross*egg + (1|Tank)+
(1|family) ,data=sp)

I do have different family IDs (n=108) for each row, I assume it creates
the problem.

Your suggestions will be much appreciated!

Regards,

Shahin

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Shahinur S. Islam
PhD Candidate, Department of Ocean Sciences
Ocean Sciences Centre, Memorial University of Newfoundland
St. John's, NL  A1C 5S7, Canada
Cell: (+1)709-740-3324; Twitter: @EcoEvoGen

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