Subject: USENET READERSHIP SUMMARY REPORT FOR JUN 95

USENET READERSHIP SUMMARY REPORT for Jun 95

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This is the first article in a monthly posting series from the Network
Measurement Project at the DEC Network Systems Laboratory in Palo Alto,
California. 

This survey is based on a sample of data taken from various USENET sites.
At the end of this message there is a short explanation of the measurement
techniques and the meaning of the various statistics. The messages that
follow this one show survey data sorted by various criteria.

The newsgroup volume and article counts that I post are often significantly
different from the ones posted by Rick Adams, because he includes the size of
a crossposted article in every group to which it is posted, whereas I charge
that size only to the first-named group. 

The complete set of readership data (of which this is a summary) is posted
in news.lists. The software that will let your site participate in the
survey is in comp.sources.d and news.admin

			Brian Reid
			reid@pa.dec.com


OVERALL SUMMARY:
                             This            Estimated
                            Sample         for entire net
Sites:                      352               350000
Fraction reporting:        0.10%                 100%
Users with accounts:     155515             67231000
Netreaders:               54994             23774000

Average readers per site:                         156
Percent of users who are netreaders:            35.36%
Average traffic per day (megabytes):          480.205
Average traffic per day (messages):            124064
Traffic measurement interval:    last              28 days
Readership measurement interval: last              75 days
Sites used to measure propagation:                352