I'm recording Users session data for my sites. I record login and logout dates/times along with pages viewed and country codes of where they visited from.
I'm having trouble working out which graphs should be used to display this information. At first glace it feels like it would make sense to display country codes (country code and count of sessions under that country code) as a pie chart, but when there is maybe only 1 country code in play, or one that dominates the statistics it seems that the pie chart is a bit of a pointless prensentation.
The real issue I have though is displaying the session information (times logged in, logged out and length of time viewed). At first I was thinking an area graph would be useful, but that doesn't easily deal with times when a session is just 25/10/2012 11:10:09 (datetime) rather than a length of time (2 records+) like 25/10/2012 11:10:09 & 25/10/2012 11:20:31 giving me a length of 10 minutes and 22 seconds. Am I using an area graph incorrectly or should I be looking at something more like a Bar Chart rather than any form of line graph.