Much research on historical data has proven that, in a market conducive to swing trading, liquid stocks tend to trade above and below a baseline value, which is portrayed on a chart with an EM). In his book, "Come Into My Trading Room: A Complete Guide to Trading" (2002), Dr. Alexander Elder uses his understanding of a stock's behavior above and below the baseline to describe the swing trader's strategy of "buying normalcy and selling mania" or "shorting normalcy and covering depression." Once the swing trader has used the EMA to identify the typical baseline on the stock chart, he or she goes long at the baseline when the stock is heading up and short at the baseline when the stock is on its way down.
Day trading poses a number of hurdles. Mainly, each trading day is slightly different. Traders need a method that works in nearly all market conditions. That doesn't mean a day trader will win every day. On the contrary, even with a great method, there still may be several losing days a month. Winning every trade or every day isn't important, it is winning over the course of each week and month that matters.