If statistics are enabled for the site, graphs and tables of user activity may be generated.
The statistics graphs and tables show how many hits there have been on various parts of your site during various time frames. They do not show how many distinct users there have been. They are processed daily at a time you specify. You must enable statistics before you will see anything.
Statistics must be enabled by a site administrator in Settings > Site administration > Advanced features.
In Moodle 2.4.2 onwards, once statistics have been enabled, the screen to configure them becomes visible as a link in Settings > Site administration > Server > Statistics. (In older versions the link was always available irrespective of whether statistics was enabled.)
The Course overview report will also then be accessible from Settings > Site administration > Reports.
Site administration settings
Various settings for statistics may be set by an administrator in Settings > Site administration > Server > Statistics.
As stats processing is somewhat resource intensive, it is recommended that you should set the stats processing to start in the early morning.
TIP: Set the stats processing to start an hour before your automated course backups are scheduled to start, then set the maximum runtime to 1 hour. This ensures that stats are not being processed at the same time as course backups are being made.
Statistics not working?
If statistics isn't working and you have checked all the obvious (such as whether it's enabled), check Settings > Site administration > Plugins > Activity modules for any old hidden modules in the database which miss the files in the moodle/mod folder on your server. If you find any, they should be deleted.
You can also try limiting the length of time logs are kept for to reduce the size of the tables. Go to Settings > Site administration > Server > Cleanup to set this.
To run stats manually, go to the database, go to the mdl_config table and set statslastdaily, statslastweekly and statslastmonthly to 0 (leave statslastmonthly alone if you think it might be large logtables causing the problem). Then go to Settings > Site administration > Server > Statistics and set statsruntimestarthour to 5 mins ago. Then visit http://www.yoursite.com/admin/cron.php. You should see output there saying that stats are processing, but be patient if it appears to hang - this can take between 5 mins and several hours depending on how big your site is, so just leave it going.
A manager, teacher or non-editing teacher (or any other user with the capability report/stats:view) can view statistics for their course in Navigation > Courses > My course > Reports > Statistics.
An administrator can view statistics for the site in Settings > Site administration > Reports > Statistics.