As there's no central point on Usenet, it is impossible to provide canonical statistics. However, having numbers such as the activity of authors, number of messages, amount of data posted for a given hierarchy or even Usenet as a whole from various points and comparing them usually gives a good idea on what's happening across Usenet. The fact that several well-known news server applications already generate such data for maintenance purposes and their ability to display them graphically in HMTL files makes the task even more easier. Statistics Usenet Computers.
Statistics is the study of the collection, analysis, interpretation, presentation, and organization of data. (wikipedia)