Dear all,
I am completely new on this forum (this is my first time), on R and on GLM. Recently I have been using the GLM to some of my data, but have been hardly struggling with the interpretation, here are some examples I would like to cite:
For example on the Rbook it appears this example using mixed models which are those I am more interested about learning: 
library(MASS)attach(bacteria)names(bacteria)library(lme4)model1<-lmer(y~trt+(week|ID),family=binomial)summary(model1)
When the model is obtained they have (I attach the most interesting part for me)
Estimated scale (compare to 1 ) 0.7029861Fixed effects:Estimate Std. Error z value Pr(>|z|)(Intercept) 2.4802 0.5877 4.220 2.44e-05 ***trtdrug -1.0422 0.8479 -1.229 0.219trtdrug+ -0.4054 0.8736 -0.464 0.643

I am sorry if my question sounds fool and altough I have been looking a lot I have not found a reference which says what is the meaning of the intercept on this data, in the case if is significant, does it have some meaning? Addittionally I would like to know what is the meaning of the | sign here and when should be used. 
Thanks in advance!  		 	   		  
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