Getting the 'edge'

Floor traders can buy at the best price and sell at asking price, and have the benefit of low commissions. Knowledge in computing and access to data give the trader this advantage. Meanwhile, long test periods and wide ranges of values are needed for developing day-trading systems. It is also practical to keep the number of conditions less while 'real-time' or 'out-sample' and 'walk-forward' tests are conducted. It would also be necessary to know the amount of capital to use.
The best advice for an off-floor trader who wants to day-trade is to develop or buy a system that will force him into action. Buying a system may save you [...]