[R] PNLS step error in nlme

[Yang, Richard]

Hi R-help;

	In using nlme, I often encounter the following error message:

		Error in nlme.formula(model = response ~ ......, data = ...
:
 		Step halving factor reduced below minimum in PNLS step

	Resetting the pnlsTol default value does not solve the problem. Any
suggestions or workarouds for solving the problem?

TIA,

Richard




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