I can't begin to guess. If your example were self contained (and
preferably simple), it would be easier to diagnose.
When I have problems like this, I often try to find a simple
example that produced the same error message. That process often leads
me to a solution. If it
Hello, I am new to non-linear growth modelling in R and I am trying to
reproduce an analysis that was done (successfully) in S-Plus.
I have a simple non-linear growth model, with no nesting. I have attempted
to simplify the call as much as possible (by creating another grouped
object,
