ABSTRACT
ISO (1991), for this new virtual (but also very real!) world. We must adapt and accept that classical data types (such as connect time) have to be replaced by new data types (such as number of connections). We stress, however, that the statistical methods described in this book apply to all types of data, whether gathered electronically or not. Once good data are obtained, by whatever method, the techniques from this book will lead to a professional management of these raw data, leading to the reports mentioned in Section 1.1.
