Quote from lindq:
Generally, the longer the timeframe, the more effective the indicator. But it all depends on the timeframe you want to trade and how you intend on using them. If you are daytrading, then obviously a weekly indicator isn't generally going to be a big help. Although if you are swing trading for a few days, a weekly indicator followed by daily price action or a shorter term indicator can be effective. So essentially the shorter the timeframe, the more you are sacrificing the effectiveness of the indicator. As with anything in trading, it is all a compromise and tradeoff. There are NO hard and fast rules with indicators. The goal is to find what works for you through testing and experimentation.