Displaying 1 result from an estimated 1 matches for "ssbaranyibr94".
2009 Sep 21
1
How to use nls when [selfStart] function returns NA or Inf??
...tting:
I'm fitting sigmoidal models to microbial growth over time. The specific
model giving me problems at the moment is only one of a whole class of such
models which I need to work with. I specify it here to illustrate that it is
not always obvious what the bounds on the parameters are.
SSbaranyiBR94<-selfStart(
model=function(Time, y0, ymax, mu, lambda, m = 1, v = mu)
{
#+
# From the paper Baranyi J. & Roberts T. A. (1994). A dynamic approach to
predicting bacterial growth in food. Int J. of Fd. Micro. 23. 277-294
# Papers equations (6), (5b), (4b)
# eq 4b: y(Time) = y0 + mu' *...