format
An object of class "grouped.data"
(inheriting from class
"data.frame"
) consisting of 10 rows and 2 columns. The
environment of the object contains the plain vector of cj
of
group boundariessource
Klugman, S. A., Panjer, H. H. and Willmot, G. E. (1998),
Loss Models, From Data to Decisions, Wiley.