[R-sig-ME] Silent conversion problem in lmer - should have said '_convergence_ problem'

S Ellison S.Ellison at lgc.co.uk
Wed Apr 20 16:43:44 CEST 2011

>>> Douglas Bates <bates at stat.wisc.edu> 19/04/2011 15:44 >>>
>The problems are due to the optimizer used in the lme4 package, which
>is the one from the nlminb function in R.  It has a habit of getting
>stuck at the lower bound.  The lme4a package uses a different
>optimizer from the minqa package and is more successful in this case.

Very interesting; thanks for taking the time to run on the alternative
package version. 
The alternative is indeed giving the same answer as 
manual calculation from the ANOVA table.

But I note you said 'in this case'; does that mean it'll be a while
before you settle on 
one or t'other?

Steve Ellison

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