What's absolute unique visitors in Google Analytics regarding my iPhone app?

I have an iPhone app connected with Google analytics. The mistery comes when checking absolute unique visitors in the https://www.google.com/analytics. It is not the different visitors have played with my app as I expected, cause i开发者_运维百科t shows a much higher number than we are in our development team. So, What's absolute unique visitors in Google Analytics regarding my iPhone app?

Thanks a lot.

Absolute unique visitors are tracked using a cookie sent to the client. If your client is unable to accept the cookie (as is probably the case with a native iPhone app) then the client will be counted each time it hits the analytics code. What you're probably seeing is a count of every use of the app.

http://www.google.com/support/googleanalytics/bin/answer.py?hl=en&answer=33087

IMHO, it's becuase in Google Analytics unique visitors != unique users.

As I understand it, Unique Visitors are measured per session and not by using a persisted unique user id on the device.

This means that:

• If the same user uses the application in 09:01 and again in 09:15 - it's still the same session (session timeuot is 30 min as far as I know) and the user is counted one unique visitor.
• But, if the same user uses the application in 09:01 and again in 11:15 - it's a whole new session and the same user is counted as 2 differnt unique visitor (=> users!=visitor).