## S3 method for class 'grouped.data':
mean(x, \dots)
Arguments
x
an object of class "grouped.data".
...
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.