Objects can be created by calls of the form new("vglmff", ...).
Warning
VGAM family functions are not compatible with
glm, nor gam (from either
gam or mgcv packages).
References
Yee, T. W. and Wild, C. J. (1996)
Vector generalized additive models.
Journal of the Royal Statistical Society, Series B, Methodological,
58, 481--493.
http://www.stat.auckland.ac.nz/~yee contains further
information on how to write VGAM family functions.
The file is amongst other VGAM PDF documentation.