How Sawmill counts Visitors
The Visitor Totals
Question: When I add up the number of visitors on each day on the month, and I compare it to the total visitors for the month, they're not equal. Why not? Also, why doesn't the sum of visitors on subpages/subdirectories add up to the total for the directory, and why don't the sum of visitors on subdomains add up to the total for the domain, etc.?
Answer: "Visitors" in Sawmill's terminology refers to unique visitors (see What does Sawmill measure?). So:
Here's why. Suppose you have a web site where only one person ever visits it, but that person visits it every day. For every day of the month, you will have a single visitor but for the month you will have a single visitor as well, because visitors are unique visitors, and there was only one visitor in the entire month.
If what you're really looking for is "visits" rather than "visitors" (so each visit will count once, even if it's the same visitor coming back over and over), then that's what Sawmill calls "sessions," and you can get information about them in The Session Overview and How Sawmill calculates Sessions.