Quote from Diode:
Actually, POP says that day traders should put their full position on at the beginning of the trade.
ALS - Wouldn't you say that adding for day traders isn't always a good rule.
POP - Adding correctly regardless of your time period is useful in making bigger gains in the long run. Day trading is certainly a shorter run. A day trader should cheapen the cost of what they have and to do this you almost certainly have to have your biggest position on first.
See http://www.webtrading.com/phantom/chapter6.htm for the complete discussion.
Yes, he states that some day traders trade at such a short term that adding is impracticle, however if you are able to it improves your performance quite a bit...
The last two sentences are excellent advice but it would help if you gave us a simple strategy and a way to determine a fast paced trend.