On 12 Jul 2015, at 17:48, Federico Calboli <federico.calboli at helsinki.fi> wrote:
On 8 Jul 2015, at 11:18, elham haem <elhamhaem at gmail.com> wrote:
Dear lme4 authors,
I have studied ?Mixed models in R using the lme4 package Part 6: Nonlinear
mixed models? by Douglas Bates. In this tutorial, there are some codes to
fit nonlinear mixed models for Theoph data. The codes are as fallows:
Th. start <- c(lKe = -2.5, lKa = 0.5 , lCl = -3)
nm1 <- nlmer ( conc ~ SSfol (Dose , Time ,lKe , lKa , lCl) ~
+ 0+ lKe+lKa+lCl +(0+ lKe| Subject )+(0+ lKa| Subject )
+ +(0+ lCl| Subject ), nAGQ =0, Theoph ,
+ start = Th.start , verbose = TRUE )
I have 2 problems:
1. when I run these codes, I see this error:
Error: unexpected '=' in:
"+ +(0+ lCl| Subject ), nAGQ =0, Theoph ,
+ start ="
2. I want to add a covariate (like age) to CL parameter. How should I
modify above codes?
When you copy code verbatim from a pdf you copy the formatting, hence the code is unlikely to work. This, which is lifted verbatim and fixed in a text editor by removing extra spaces in the formatting, and the line breaks, works.
library(lme4)
data(Theph)