These totals depend on the Field Limits, which are shown at the bottom of this and every other statistics page (a summary of them also appears at the very top). The Field Limits are live filters which you can use to view only part of your data, for instance to zoom in on a particular part of the statistics. To change the Field Limits, click an "edit limit" link in the Field Limits Editor (you may need to click "Field Limits" to show it), or use the calendar view.

The list at the right shows the available views of the statistics. All of these views are based on the same data (the data described by the Field Limits), but each view breaks down the statistics differently. Click any view name to show that view. You can also change views at any time by choosing a new view from the View menu at the top of the page. For instance, you can return to this page at any time by choosing "overview."