Another form of locating ,'trends', is a little more complicated, but, for those who understand how to use it, find it helpful. It is the Fibonacci curve. Below is the best explanation of how it works. There is actually a lot of info available on this and is commonly used by advanced swing traders. This is for the math guy's and brainiacs.
GLTA
http://stockcharts.com/school/doku.php?id=cha...retracemen