Dear r-help,
I have a question about the std error of a lmer model with library
(LmerTest).
I have 12 sites with 6 treatments over each site. I measured some response
variable (biomass_of_insects) (with a gaussian distribution).
I did :
library (LmerTest)
model<- lmer((biomass_of_insects) ~ as.factor(treatments) + (1 | sites))
However, the response of the model show always the same std error (see
below):
Fixed effects:
Estimate Std. Error df t value Pr(>|t|)
(Intercept) 501.333 80.656 66.000 6.216 3.91e-08 ***
as.factor(treat)F 126.667 114.065 66.000 1.110 0.271
as.factor(treat)I -8.333 114.065 66.000 -0.073 0.942
as.factor(treat)I+F1/3 -75.000 114.065 66.000 -0.658 0.513
as.factor(treat)I+F2/3 18.333 114.065 66.000 0.161 0.873
as.factor(treat)I+F3/3 15.917 114.065 66.000 0.140 0.889
Do you know why std.error is always the same ?
Thank you very much,
Aline
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