I think people draw a false distinction between a "day" and "position" trader.
Let's say that using quantitative analysis...
You determine that a $25.00 stock is $0.50 "undervalued".
So you buy 2000 shares at $25.00
You can wait 2-3 weeks for the stock to revert to "historical norms"...
And make, say, $0.40 in 12 trading days = $800
Or you might get the chance to flip the stock for $0.08 in 30 minutes = $160
But in the 2-3 hypothetical weeks it takes the stock to "revert to norm"...
You can probably do that flip 5-10 times.
So it's actually not very clear... what is the optimal time frame to exploit quant analysis.
Your expected return is about the same no matter what time frame you use... with 2 caveats:
(1) Your psychological makeup should dictate scalping versus position trading.
(2) Low transaction costs enhance scalping... high transaction costs make position trading mandatory.
With zero transaction costs... scalping is far more profitable.
Bottom line... a good trader should employ an optimal mix of scalping/position trading.
rm+
