help: error in fn(x, ...): Downdated VtV is not positive definite
what is frace? This is a relatively rare error message. It usually indicates a strongly unbalanced/unstable model for some reason. Have you tried rescaling parameters? Do simpler versions of the model work?
On Thu, Jul 19, 2018 at 3:15 PM Ahreum Maeng <amaengwork at gmail.com> wrote:
Hello,
I got a following error message while running a MLM using lme4 package.
Error in fn(x, ...) : Downdated VtV is not positive definite
my model was as following:
out <- lmer(situ ~ cult*change + (change || id) + (0 + frace | type), data
= tidy.total, REML=FALSE)
where
situ: numeric
change: numeric
cult: factor (coded in 1 and -1)
How could I fix this issue?
Thanks a lot,
Ahreum
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