This results in a count of the number of visits that crossed that document. It is also possible to match trails that mention a particular document, in which case the number of unique paths crossing that document is measured. This entry counts the number of visits that began on Yahoo and passed through a particular page. The advanced example shown here includes a special function line. Instead of matching a certain document, this line's value is computed by performing arithmetic on the other entries.
Numbers can appear, with or without a decimal point.
Calculations are carried out according to the normal rules of algebra. Parentheses are also allowed. Most importantly, references to the results of of earlier lines are allowed , much like references to another cell in a spreadsheet program. Functions can make a reference to the result of any prior entry. The clicks are counted through the use of the provided clickthrough.cgi CGI program.