[R] Re: errors in randomization test
CR Bleay, School Biological Sciences
Colin.Bleay at bristol.ac.uk
Tue Jul 6 13:53:40 CEST 2004
last week i sent an e-mail about dealing with errors thrown up from a
glm.nb model carried out on multiple random datasets.
every so often a dataset is created which results in the following error
after a call to glm.nb:
"Error: NA/NaN/Inf in foreign function call (arg 1)
In addition: Warning message:
Step size truncated due to divergence"
I am at a loss as to how to deal with this.
firstly because the dataset that is generated, although throwing an error
when the glm.nb model is applied, is a valid dataset. so how do i
incorporate this dataset in my results (results being descriptive stats on
the coefficients from the multiple datasets) i.e. shoould coefficients be
set to zero?
secondly, how do i capture and deal with the error. is it possible to
construct an "if" statement so that "if error, do this, if not continue"
lastly, i am unsure as to what characteristics of a dataset would result in
these errors in the glm.nb?
i would be very grateful for any assistance on this matter. i having been
staring at code for too many days now and so can't see the wood for the
Dr Colin Bleay
Dept. Biological Sciences,
University of Bristol,
Tel: 44 (0)117 928 7470
Fax: 44 (0)117
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