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Measuring Internet Access

A measure of the success of the web-site is the annual number of distinct e-Visitors (DEVs) to Armagh, in fact the number of distinct hosts served by the Observatory's web-site. This is a lower limit to the number of e-Visitors, owing to caching by big servers and sharing or repeat visits from the same IP number. (For comparison, the number of `hits' on the Armagh web-site, defined as the number of successful page requests, is typically 5-10 times greater than the DEV statistic.) During 2003, the numbers of successful page requests (i.e. `hits') to files of all types on each of the three web-sites listed were 3,983,000 (7-month's data), 890,000, and 675,000 respectively, whilst an estimated 470,000 Distinct e-Visitors visited the three web-sites during the year. DEV-statistics for the whole Armagh Observatory web-site are given in Table 3.

A third, and arguably more useful, statistic for the `value' of a web-site is the amount of data transferred to other users. A single hit or DEV simply demonstrates that someone looked at the Observatory web-site, but it does not indicate how long they stayed or what they thought of the information provided. The amount of data transferred from the Armagh web-site, however, provides an indication of its value as a provider of information. For the three Observatory web-sites noted above, the figures for data transferred during 2003 are 210GB (7 month's data), 31GB and 42GB, corresponding to a projected figure for the year totalling approximately 400GB.

Table 3: Distinct e-Visitors to the Armagh Observatory web-site. Note that the 2002 figure for arpc65 represents only 6-months data and the 2003 figure for star represents only 7-months data. Correcting the latter for incompleteness (data loss during a change of the main web-server) the corrected annual DEV for star would be approximately 325,000, making a grand total for the year of approximately 470,000. These corrections have been applied in computing revised baseline figures for the period 2001-2003 inclusive.

Year	Number of Distinct e-Visitors (DEVs)
	http://star.arm.ac.uk/	http://climate.arm.ac.uk/	http://arpc65.arm.ac.uk/$\sim$spm/	Total
	star	climate	arpc65
1998	80,000	--	--	80,000
1999	134,000	--	--	134,000
2000	174,000	--	--	174,000
Average	129,000	--	--	129,000
2001	317,000	1,000		318,000
2002	322,000	5,000	27,000	354,000
2003	190,000	49,000	96,000	335,000
New Average	321,000	18,000	75,000	390,000