I am doing some testing with Google Analytics to see how it does its tracking.  I noticed after testing that it is only capturing 65% of my traffic.  This is what I did: Go to site in Internet Explorer Navigate aroundClear cache/cookies/history etcClose browserStart at the beginningI did this 1-4 times yesterday on 5 different browsers for a total of 13 times.  Only 9 sessions are showing up in Google Analytics.  I am expecting 13 sessions to show up.  Edit: It seems like Google does their tracking primarily with cookies, so I think that clearing my cookies should have reset my session.  
Google Analytics not capturing all sessions
google analytics;session
20 hours is not always enough for everything to show up in reports.  It can take 24 hours and in some cases I even see it taking 48 hours.  Their documentation states:Processing latency is 24-48 hours. Standard accounts that send more than 200,000 sessions per day to Google Analytics will result in the reports being refreshed only once a day. This can delay updates to reports and metrics for up to two days. There is also the issue of sampling.   Google Analytics doesn't always measure everything.   Sometimes it only measures part of your visitors and estimates the rest.   When this happens the reports say that they are based on sampled data.