Hi All, I am reading the following article: http://www.investopedia.com/articles/technical/03/070203.asp#axzz1dx976t9W. I am wondering how you choose the parameters for the technical indicators. For example, you choose 80/20 rather than 70/30 for the overbought/oversold conditions for RSI to ensure that you do not pull the trigger too early when buying or selling. The time periods for both the RSI and Momentum indicators are 12 day periods. How do you decide what period to use? Why not 10 or 20 day periods? Please forgive if the question betrays my newness to the world of trading. Thanks, and Cheers!