Hello,
I have recently used lme4 package to run a glmm, but a get 0 variance
explained by the random effect. The model has 5 fixed effects, and I have
run each of them separately and for two of them (F1, F3) I also get 0
variance for the random effect. Do you have any ideas of what might be
causing this? Is this kind of result to be expected?
thanks


Generalized linear mixed model fit by the Laplace approximation
Formula: DV ~ F1 + F2 + F3 + F4 + F5 (1 | R1)
   Data: JD
   AIC   BIC logLik deviance
 203.2 225.9  -94.6    189.2
Random effects:
 Groups Name        Variance Std.Dev.
 R1  (Intercept)  0        0
Number of obs: 190, groups: R1, 14
Fixed effects:
            Estimate Std. Error z value Pr(>|z|)
(Intercept)   1.8949     1.1869   1.596  0.11039
F1          4.6740     2.4365   1.918  0.05507 .
F2         -2.0657     0.7543  -2.739  0.00617 **
F3       21.8036     8.8890   2.453  0.01417 *
F4   1.0968     0.4874   2.250  0.02444 *
F5      -1.7430     0.9583  -1.819  0.06894 .

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