I am new to RStudio and have a problem when loading the package 'lcmm' from my data.
This is the following code I am using:
dat = baseline4_0
lcmm11 <- lcmm(K1 ~ poly(year, degree = 1, raw = TRUE), random =~ year,
subject = 'nsin', data = dat, ng = 1, link = 'linear')
No matter what I do, I keep getting the error:
[.data.frame(newdata, , nom.subject) :
undefined columns selected
Thanks in advance for your help.