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DAY - Position Sizing in day trading



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I am day trading currencies - I have been studying position sizing, as 
explained by Van Tharp, and trying to figure out a good way to utilize it in 
my day trading.  I understand risk management and try to make sure that I cut 
my losses quickly and efficiently - when I feel strongly about a market 
trending, I will let profits run and exit on a market order, or a limit or 
MIT.  My trouble right now is first defining position sizing clearly in a day 
trading context, and then applying some sort of position sizing discipline to 
my trading.  My concept of it in the simplest terms is basically number of 
contracts purchased: you want to have more contracts on winning trades and 
less on losing trades in the end.  So entering each trade with 2 contracts, 
you could add to those when the trade trends in your direction, or just lose 
the 2 if it goes against you in a short time frame.  I am struggling with 
whether to make it mechanical, like if the market moves 10 points to the good 
from my entry and indicators still look good, then purchase 2 more contracts 
and adjust a new 4 contract protection stop down close to the new entry point 
- I am just beginning to play with this and am finding it hard to wrap my 
brain around the risk/reward ratios involved with this scenario.  Does 
anybody have any thoughts on approaches to position sizing in a day trading 
context? 
Thanks and g'day
Kent