Quote from AAAintheBeltway:
We have had this discussion several times here and it usually produces a spirited debate. The two camps are pretty clear. One side says NEVER add to a loser. The other says scaling is ok, as you cannever nailk the entry exactly.
There is one situation where I will double up a loser. I got this technique from the book, West of Wall Street, which is old and not that well written but it kind of pulled a lot of things together for me when I was getting started. Say you put on a trade and it goes against you but the market has a lot of chop. Wait until it's almost at your stop, then double up. If you hit your stop, blow them all out. Now here's the key. If it goes your way, get out at breakeven on the double position. The trade has already told you it was shaky by going down. All you want to do is breakeven. You're not risking that much on the additional cars and you've greatly increased your chances of a breakeven. But don't push your luck. Another key is to avoid the temptation to double up too soon. I don't do this often, but it can save your day.