Here is a look at the 25 best and 25 worst ETFs from the past week. Traders can use this list to find prospective candidates that have deviated too far from their longer-term trends, thereby serving as potential starting points for those looking to take on either short or long positions. Likewise, traders can also use this list to spot potential trend reversal opportunities that may offer a generous risk/reward. As always, investors of all experience levels are advised to use stop-loss orders and practice disciplined profit-taking techniques. To get access to all ETFdb.com premium content, sign up for a free 14-day trial to ETFdb.com Pro .