The default time setting for RSI on my Scottrade Elite platform is 14 (13 smoothing). I'm pretty sure this is the more popular setting. However, I just read an article where the author recommends using 21 to eliminate some false signals. IMO, technical analysis works because so many people follow it and react to it at the same time, right? So would you be better off keeping it at 14? The above assumes using a 3 to 12 month, daily chart. I don't use RSI on my 5 minute, one day charts but if I did would the time setting have to be changed? If so, what's the best for a 5 minute chart? Thanks.