  Dear Madam/Sir,
         I am a new R-user, my name is Dong Xie. I write this letter 
because I have some questions about the lme4 package and I need your 
help. Recently, I conducted an experiment about plant growing in 
different nutrient-level sediments. I harvested these every three week 
(three harvests in all). Some growth traits of these plants were 
recorded (e.g. total biomass, leaf biomass and stem biomass). However, I 
found that the total plant biomass may also influence these traits. So, 
I am going to use total biomass as covariate to do the statistical 
analysis. Meanwhile, this experimental design is repeated design, I 
guess I have to do the repeated-measurement to analyze the growth traits 
between different nutrient-levels. So my question is that whether the 
lme4 package can do such statistical analysis (i.e. repeated-measurement 
with covariate)? If this is not too much trouble, would you like to give 
me some examples?
Thank you for your time reading this letter. I am looking forward to 
hearing from you.

Sincerely,

Dong Xie

-- 
Dong Xie
Postdoc at Nanjing University, College of Life Science, Nanjing 
University, China
Cell: +86 14705148574
Email: xiedong0123@gmail.com

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