Accuracy of numbers provided by the "Statistics Advanced" module?
As it relates to Statistics Advanced, you may want to take into account some of the options mentioned on its project page. Such as:


  Only track 'unique' views of content: If you keep viewing a node over and over again, the "x reads" counter won't increase each time. This is applied on a per-user basis as well as a per session id for anonymous users.


Refer to the project page for other options mentioned there.

Disclosure: I'm the (new) maintainer of Statistics Advanced.