Hi all,
I've been struggling with trying to specify a diagnoal matrix for linear mixed
effects model. I think I've got nearly everything correct, except the following
message appears:
In lme.formula(fixed = fwave ~ sex + sexXbulbar + visit + age + :
Fewer observations than random effects in all level 1 groups
Not sure if i've provided enough details, but I'm basically trying to perform a
mixed effects model analysis, controlling for several covariates. Incorporating
random effects for the intercept and slope.
What does the second line, 'Fewer observations than random effects in all level
1 groups' mean?
Many thanks in advance,
Ben Cheah
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