I've actually done statistical analysis for adding
to losers. And more recently, I've had a few clients do it as a means of corporal punishment...
And I've also heard Chip Kenyon, one of the best CBOT Bond Traders
EVER, tell a packed audience room that adding to losers was, and I quote, "a disease".
One of my personal mentors, David Ellis, routinely
fired traders for doing it. On the spot. Locked up their TT screens remotely and escorted them straight out the door. He'd much rather see you take a loss on a 500 lot than keep adding 100 lots to a stinker as it got stinkier.
I know for a fact that several Bond traders on the floor sought psychological counseling in order to stop the practice of adding to losers. In the early 1990's a psychiatrist gave a presentation at a CBOT-sponsored conference about "adding" as one of the primary psychological sabotage mechanisms. There's truly some cognitive reasoning faults and bad emotional behaviors at work...