N-1-2-040.70 USENET Readership Summary Report for March 1992 by Brian Reid, and Rick Adams, This is the first article in a monthly posting series from the Network Measurement Project at the DEC Western Research Laboratory in Palo Alto, California. This survey is based on a sample of data taken from various USENET sites. At the end of this article 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 OVERALL SUMMARY: This Estimated Sample for entire net Sites: 830 45000 Fraction reporting: 1.84% 100% Users with accounts: 194341 10536000 Netreaders: 42839 2322000 Average readers per site: 52 Percent of users who are netreaders: 22.04% Average traffic per day (megabytes): 34.869 Average traffic per day (messages): 14329 Traffic measurement interval: last 28 days Readership measurement interval: last 75 days Sites used to measure propagation: 829 From: rick@uunet.uu.net 208256 articles, totaling 410.718444 Mbytes (505.190688 including headers), were submitted from 18337 different Usenet sites by 52109 different users to 2160 different newsgroups for an average of 29.337032 Mbytes (36.085049 including headers) per day. Article Total Category Count Mbytes Percent Mbytes alt 40600 141.419297 34% 160.810095 comp 47008 90.656343 22% 112.275455 rec 63705 88.344278 21% 116.644629 soc 25185 45.740411 11% 58.350678 talk 10461 21.566199 5% 26.985346 bit 12083 16.386749 3% 22.379109 misc 10222 16.106943 3% 20.783631 sci 8304 15.999018 3% 19.997566 clari 6183 15.607980 3% 19.600248 fj 5569 14.973089 3% 17.828647 bionet 4303 12.547041 3% 14.299711 news 2005 5.649594 1% 6.635805 vmsnet 855 2.670023 0% 3.065041 gnu 1128 2.535230 0% 3.028568 biz 394 0.773576 0% 1.004241 inet 192 0.376480 0% 0.451642 eunet 205 0.256463 0% 0.367313 de 20 0.100059 0% 0.111118 sfnet 9 0.025062 0% 0.030310 k12 6 0.006327 0% 0.010147 Propagation Delay to uunet No. of Cumulative Hourly Breakdown of First Day Days Articles Percent Hours Articles Percent <0 1552 0% (Time Warp) -1 708 0% 1 196031 95% 1 104128 50% 2 6034 98% 2 34058 66% 3 1746 98% 3 14992 74% 4 810 99% 4 8671 78% 5 436 99% 5 6492 81% 6 288 99% 6 4247 83% 7 192 99% 7 3018 84% 8 132 99% 8 2471 86% 9 65 99% 9 2176 87% 10 39 99% 10 2024 88% 11 21 99% 11 1740 89% 12 40 99% 12 1487 89% 13 45 99% 13 1297 90% 14 19 99% 14 1217 90% 15 5 99% 15 1053 91% 16 5 99% 16 982 91% 17 6 99% 17 889 92% 18 2 99% 18 849 92% 19 3 99% 19 853 93% 20 3 99% 20 882 93% 21 4 99% 21 722 93% 22 3 99% 22 596 94% 23 0 99% 23 654 94% 25 1 99% 28 2 100% Average delay per article is 5.2 hours Article Size Distribution: % of % of % of % of Kbytes Count Articles Bytes Kbytes Count Articles Bytes 1 56801 27.3% 8.6% 9 635 0.3% 1.1% 2 95661 45.9% 27.7% 10 444 0.2% 0.9% 3 29724 14.3% 14.5% 11 344 0.2% 0.7% 4 10738 5.2% 7.5% 12 290 0.1% 0.7% 5 4943 2.4% 4.5% 13 202 0.1% 0.5% 6 2558 1.2% 2.8% 14 208 0.1% 0.6% 7 1485 0.7% 1.9% 15 171 0.1% 0.5% 8 975 0.5% 1.5% >= 16 3077 1.5% 26.1% Historical Traffic Data 14 days Mbytes Posting Active ending Articles per day Sites Users Groups 910909 124208 17.546 13503 33411 1657 910923 137682 19.600 14389 36719 1740 911008 137225 20.215 14565 37797 1732 911023 142161 20.124 14572 38388 1758 911111 154597 21.072 15531 41378 1810 911127 163345 22.330 15860 43955 1891 911209 145496 22.131 14997 39474 1851 920109 107114 16.686 12452 29869 1725 920211 195672 27.709 18092 49442 2045 920224 186934 26.287 17859 48591 2070 920312 185487 25.844 18259 48937 2081 920325 208256 29.337 18337 52109 2160