further arguments passed to or from other methods.
Value
A named vector of means.
Details
The mean of grouped data with group boundaries $c[1], \dots, c[r]$ and group frequencies $n[1], \dots, n[r]$ is
$$\sum_{j = 1}^r \frac{c_{j - 1} + c_j}{2}\, n_j.$$
References
Klugman, S. A., Panjer, H. H. and Willmot, G. E. (1998),
Loss Models, From Data to Decisions, Wiley.
See Also
grouped.data to create grouped data objects;
emm to compute higher moments.