Displaying 1 result from an estimated 1 matches for "sexxbulbar".
2010 Feb 14
1
Problem with specifying variance-covariance matrix for random effects (nlme package)
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.
Wha...