Hi everyone,

Firstly I would like to introduce myself. I am a PhD student in
Australia studying the decomposition dynamics of Eucalyptus coarse
woody debris, and its carbon release to the environment.

I have a problem with coding the double-exponential decay model into
the statistical package S-PLUS. If anybody out there has done this
analysis with S-PLUS, please contact me, as I need help with the
coding. [I am using the nls and nlme commands with the coding: ~w*exp
(-k1*t)+(1-w)* (-k2*t)]. I have no problems with the single-
exponential model, but cannot get the double-exponential model to
work.


Cheers
Eddie Webber