Subject: data points expert help
calling data gurus....
i thought this may be finally possible , but several (free) AI engines spat out excuses and no answer.

- is there a source, or inference derivation, for mean\median cost basis for retail shareholders in very liquid mid-mega cap stocks?
- along same lines, mean\median holding period ?

am not dogmatic on defining retail (e.g., <1000 shares...) and such, i just want a decent stab using non-stale data within the past few weeks.