Also plotted is their Coincident Economic Index (CEI), which has continued to make higher highs since bottoming in 2009.

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On the bottom of the chart, I have also plotted (in green) a comparison of the health care providers to the overall health care sector.

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It is similar to a Hertzsprung-Russell (HR) diagram but the latter plots luminosity (or absolute magnitude) rather than just apparent brightness and a knowledge of the distances of the stars plotted is also needed.

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In my early adaptation of the OBV, I had also added a 21-period weighted moving average (WMA) of the OBV, which is plotted in green.

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