glm.control
Auxiliary for Controlling GLM Fitting
Auxiliary function for glm
fitting.
Typically only used internally by glm.fit
, but may be
used to construct a control
argument to either function.
Usage
glm.control(epsilon = 1e8, maxit = 25, trace = FALSE)
Arguments
 epsilon
 positive convergence tolerance $\epsilon$; the iterations converge when $dev  dev_{old}/(dev + 0.1) < \epsilon$.
 maxit
 integer giving the maximal number of IWLS iterations.
 trace
 logical indicating if output should be produced for each iteration.
Details
The control
argument of glm
is by default passed
to the control
argument of glm.fit
, which uses
its elements as arguments to glm.control
: the latter provides
defaults and sanity checking.
If epsilon
is small (less than $1e10$) it is
also used as the tolerance for the detection of collinearity in the
least squares solution.
When trace
is true, calls to cat
produce the
output for each IWLS iteration. Hence, options(digits = *)
can be used to increase the precision, see the example.
Value

A list with components named as the arguments.
References
Hastie, T. J. and Pregibon, D. (1992) Generalized linear models. Chapter 6 of Statistical Models in S eds J. M. Chambers and T. J. Hastie, Wadsworth & Brooks/Cole.