[R-sig-ME] Anomalous results with glmer().

David Duffy David.Duffy at qimr.edu.au
Wed May 28 04:49:55 CEST 2014

On Wed, 28 May 2014, Rolf Turner wrote:

> Some months back I sent an inquiry to this list concerning the analysis of 
> some linguistics data with which I am involved.
> essentially zero.  Which is silly.
> If I fit the same model using lme4 version 1.1-7 (and ignore the warning 
> about failure to converge) I get sensible looking estimates of the variances 
> of the random effects, but an impossibly wrong estimate
> of at least one of the fixed effect coefficients.  (The estimate says that 
> the success probability is larger for phoneme type "Mclus" than it is for the 
> baseline type "Fclus".  However a raw tabulation show that the success 
> probability for Mclus is much, much smaller than for Fclus.

glm               -2.6950  (0.10455)

glmer (+Stud)     -2.74464 (0.10536)
glmer (+Words)     0.36826 (0.19783)
glmer (+S+W)       0.33574 (0.19981)

glmmML (+Stud)    -2.7444 (0.10546)
glmmML (+Words)    0.3683 (0.19816)

It's words that will always get you into trouble...

| David Duffy (MBBS PhD)
| email: David.Duffy at qimrberghofer.edu.au  ph: INT+61+7+3362-0217 fax: -0101
| Genetic Epidemiology, QIMR Berghofer Institute of Medical Research
| 300 Herston Rd, Brisbane, Queensland 4006, Australia  GPG 4D0B994A

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