What EMA Combinations?

Technical Tool: 17 and 43 Week EMA Crossovers

Hi,

I have searched a lot to find a good EMA combination for my EMA Crossover System. Some people suggest 13/21 EMA for daily charts and other prefer 3/18 EMA. Thus it is very confusing and further I have not enought technical resources to compelete my reaserch, I write these words here on hope of recieving som helping comments for my confusing.

I am intra-trading CFD index (S&P 500) and I use EMA indicator to identify the trend. I use Bollinger bands with standard diaults together with MACD and Stochastics.

My concerns are choosing of time frame and EMA settings. What time frame is suitable (1, 2, 3, 5, 10, 15, 30 or 60 minutes)? What EMA settings are you suggesting (4/9/18, 3/18, 5/20, 10/20, 13/21, 3/5/15, 3/7/21)??

Many thanks in advance for any answer to: strategytrading@gmail....