Example: go to $OTRS_HOME/var/cron and add your own text file, e.g. marcel_stats

Use these contents (e.g. for quarterly reports):

1 0 1 1,4,7,10 * /opt/otrs/bin/otrs.GenerateStats.pl -n 10101 -r your@email.adddress  -s otrs@from_address -m 'OTRS Quarterly Report'

-f Print

The –n number is the report ID which you can find through the interface.

Sander