I can tell you that this is a tough question to answer for the following reason.
There is a guy who who became a friend of mind who came into our office and trained with us. After about two weeks he bagged our training and traded nasdaq stocks and made a little money at first. Then he lost some. Then he bought 400 SCH and was down 50 cents. He went to lunch. Came back- down more. Finally closed it out after losing $20,000.00. plus.
Then he committed to our style. Profitable within two weeks. In January 2000, which was about his fourth month, he made $100,000.00 . During 2000 he made over $300,000.00. In 2001 by July, he gave back more than $100,000.00 and quit trading for a while. Does he go in to the positive trader column or not.
In 1999 and 2000 I believe that all of the traders in our office (10-15 traders) were profitable except about 3. (Two of those traders were not trained by us and did not trade our style so you might say all but one of the short term traders were profitable)
During 2001 we took on 5 or 6 new traders and only 2 to three of them are profitable, plus we lost the one trader mentioned above. So as a group this year we are only around 50% profitable for the year. Those new traders were all backed with our money and unfortunately for us this fall was much tougher for short term trading NYSE stocks than previous falls. (They did not lose much capital, nevertheless we hate to lose any money at all)
I normally do not talk about this stuff and the lawyer in me wants to post the standard warning, in case this post creates problems. Trading is difficult, you could lose all your money. Past performance does not equal future performance and my firm does not solicit retail traders.