Dear R Help,
in my research I frequently work with binomial response models, which
are of course part of the generalized linear models. While I do use
common link functions such as the logit, probit and cloglog, I often
have the need of invoking the lesser-known Complementary Log link
(Walter W. Piegorsch, 1992, "Complementary Log Regression for
Generalized Linear Models ", The American Statistician , Vol. 46, No. 2,
pp. 94-99 ) which is based on the exponential distribution.
Before the release of R 3.0, I simply could do so by adding the
following lines to the long switch command in make.link(...):
clog = {
linkfun <- function(mu) qexp(mu)
linkinv <- function(eta) pmax(.Machine$double.eps,pexp(eta))
mu.eta <- function(eta) pmax(dexp(eta), .Machine$double.eps)
valideta <- function(eta) all(eta > 0)
},
and then add "clog" to the okLinks vector in binomial(). However, I
recently installed R 3.0.2 and cannot get the clog link to work. I guess
it has to do do with the fact that both make.link and binomial are
residing in the Global environment, and does I do not know how to access
the C routine C_binomial_dev_resids to compute the deviance residuals
within binomial().
While I would appreciate any help on this issue, I also thought it may
benefit other users in my research area to have the complementary log
link included in make.link. Any chance of this happening?
Thanks a lot,
Roland Deutsch
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