The monitored WebPages are objects found on the monitored WebSites. The pages were randomly selected. However, less than 20 percent of the WebSite sample lies below the SLD, but never below the second slash. WebPage data have been collected on a weekly basis. December 1996, July 1997, January-February 1998, and October 1998.
WebPages manifest an interesting progression over time.
As a general rule, attrition rate is nearly linear. A WebPage is considered comatose if it is non-responsive for at least six collection periods, including the most recent. At any given time, approximately five percent of all WebPages are gone, but are intermittent and will return. Some WebPage intermittence is explained by associated WebSite intermittence, but by no means all. Note in Figure 1. , that by October 1998, about 20 percent of WebSites were gone, but approximately 40 percent of WebPages were also gone.