When it comes to short-term investing or trading, they say "the trend is your friend." And there's no denying that this is the most profitable strategy. But making sure of the sustainability of a trend to profit from it is easier said than done.Often, the direction of a stock's price movement reverses quickly after taking a position in it, making investors incur a short-term capital loss. So, it's important to ensure that there are enough factors -- such as sound fundamentals, positive earnings estimate rev ...