Results returned by the VisitSummary.getUniqueVisitors API call over a date range are not consistent.
For example, the sum of the counts for the following call:
do NOT equal the sum of the counts for this call:
The same issue arises when comparing period = month to period = year for the same date range. In fact, the numbers seem different for all periods of day,month,week,year. What gives?
See attached files for output of calls over the date range 2011-01-01,2011-12-31 .
This is expected, a unique visitor can visit the same many times in the same month.