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: http://star.arm.ac.uk/annrep/annrep2003/node66.html
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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.