Dear lme4 users,

I am having convergence problems fitting an exponential decay model using 
nlmer in package lme4 

To help overcome the problems I considered two options, neither of which I 
seem to be able to successfully implement.

These are:

1. Modify the starting values in the ST slot
2. Increase the maximum number of iterations.

For example, if I fit the model and assign the output to a1, and then 
re-run same model but with the start modified to

             start=list(fixed=a1@fixef, ST=a1@ST)

the ST in the start list is ignored.

Also, if I add the option, control=list(maxIter=500), this too is ignored

Can someone point me to examples that illustrate how I can modify these to 
variables.

***********************************************************
Remy van de Ven
Biometrician, I&I NSW
1447 Forest Road  ORANGE  NSW  2800  AUSTRALIA
Phone  02 6391 3831,          Fax:  02 6391 3899

Email: remy.van.de.ven@industry.nsw.gov.au
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