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I have seen it used before, so I wanted to work out my % expectancy so I could compare it to the people I have seen use it. Serves no real purpose otherwise (I'm still trolling around trying to find where i've seen it)

Oh and that equation you used before that I called alpha, isnt acutally alpha because it doesn't factor in a benchmark performance index.

http://www.investopedia.com/terms/a/alpha.asp

I've had better days