gvif: Get GVIF for each variableGet generalized variance inflation factor (GVIF) for each variable. See Fox (1992) 10.1080/01621459.1992.10475190 for more details on how to calculate GVIF.
gvif(mod, family)A model object with at least two explanatory variables
A description of the error distribution and link function to be
used in the model. It can take the value of \code{gaussian}, \code{binomial},
\code{poisson}, and \code{cox}.
A vector of GVIF for each variable in the model