With stock evaluations, we have the "[golden cross](http://www.investopedia.com/terms/g/goldencross.asp)" event where short and long term moving averages cross over and we have a potential bull market soon. I have seen some definitions use the 200 day moving average to the 50 day. I also saw another use 100 day to the 50 day. Then, of course, you can set your own time lines to research. Which is the most common moving day averages combination used for a golden cross analysis or observation in determining a potential future bull market?