+2  A: 

I believe it's just an issue of grouping. The top right of the graph has 3 icons to group by day, week, or month. It's currently grouping by day. So if I visit your site today and come back tomorrow, I'll be counted once for each day.

I tried looking at the month view for one of my sites but it didn't give me much meaningful data. I believe the above should answer your original confusion though.

Jonathan S.  2009-09-22 16:27:58
Helpful clue, but not the full story I think. See my edit above.
Chip Kaye  2009-09-22 18:28:17
Have you looked at the report under Visitors > New vs. Returning? You can change the graph to display % New Visits which might be closer to what you are trying to find.
Jonathan S.  2009-09-22 18:34:35
Interesting report, but unfortunately tallies only in terms of Visits and not Unique Visitors.
Chip Kaye  2009-09-22 18:49:35

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