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transect
2008 Feb 13
1
lmer: Estimated variance-covariance is singular, false convergence
...r fieldwork, we recorded 90 Transects in 3 climbing sites. The aim is
to see, if the plant cover (response: Cover) is influenced only by
crevice availability (predictor: Cracs), or, additional, by the distance
to the climbing route (predictor: Distance). Six plots are nested within
one Transect (ID.Transekt), the Transects are nested within the climbing
site (Site).
I tried to fit two linear mixed models with lmer(), and to compare them
by anova():
> cracks.lmer <- lmer (Cover ~ Cracks + Distance + (Cracks + Distance |
> + Site / ID.Transekt) , method = ("ML"))
Warning message...