[R] step halving factor reduced below minimum

[sw289]

Dear Splus and R users:
I have a problem in fitting a NLME model, the error message is:

step halving factor reduced below minimum in PNLS step

What does it mean and how to fix the problem, could anyone help me 
about it?

Any suggestion/help would be greatly appreciated.

Mei

__
[EMAIL PROTECTED] mailing list
https://www.stat.math.ethz.ch/mailman/listinfo/r-help

Re: [R] step halving factor reduced below minimum

[Douglas Bates]

[EMAIL PROTECTED] writes:

 Dear Splus and R users:
 I have a problem in fitting a NLME model, the error message is:
 
 step halving factor reduced below minimum in PNLS step
 
 What does it mean and how to fix the problem, could anyone help me 
 about it?
 
 Any suggestion/help would be greatly appreciated.

Turn on the verbose option (i.e. add verbose = TRUE to the nlme call)
to see what is happening to the parameter estimates during the
iterations.  That should give you a clue as to why the estimation
algorithm is not converging.

__
[EMAIL PROTECTED] mailing list
https://www.stat.math.ethz.ch/mailman/listinfo/r-help