Chart Analysis : The weekly chart of the ten-year T-Note yield ( TNX) shows the high in yield at over 5% in early July 2007.

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Computer models are written for everything from determining early pre-payments on mortgages to the probability that a high-yield bond will default.

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The chart from The Wall Street Journal shows the dramatic rise of the Barclays US Corporate High Yield Bond Index in 2012, and the further gains in early 2013.

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