For that info you better setup (if not already done) and use usage tracking. In the past I found the created and last modifier info to be a bit weird, while usage tracking is more reliable.
Thanks Gianni Ceresa,
Good thought! usage tracking should be perfect fit to know what are the Analysis in use.. I will try to integrate runcat along with usage tracking..
You can easily script things, doing queries on the usage tracking table and loading the runcat results with a list of all the objects etc.
I also have the impression the create and modified date you get from runcat are ... a bit random (I had some weird results in the past on those fields).
Thanks Gianni Ceresa!