Admins: Title Report vs Site Activity Report, how “unique documents” are counted

The count for “Unique Documents” is different if you look at each month separately, or if you look at multiple months all together as one set.

When the Title Report is run over multiple months, it puts all the data together as one set and the number of titles on the report is the count of unique documents for the whole data set.

In contrast, when the Site Activity Report is run over multiple months, it reports on each month separately.

So you cannot compare the Unique Documents in the Title Report to those in the Site Activity Report for multi-month time periods because the Unique Documents count is different if you look at all the months in one pool versus each month separately.

For example, let’s say book X gets used several times in July and several times in August.  If you look at July and August separately, book X will count as 1 unique document in July and 1 in August.  But if you look at the whole time period July through August as one set, book X will count as just 1 unique document in that time period.