VXX AND VIX relationship and calculation

http://investing.kuchita.com/2011/08/21/vxx-data-since-vix-futures-avilable-march-2003/

http://investing.kuchita.com/2011/08/16/how-the-vxx-is-calculated-and-why-backwardation-amplfies-it/#comment-15925

http://investing.kuchita.com/2011/08/15/vxx-data-since-sept-2009/

http://investing.kuchita.com/2011/08/15/contangobackwardation-vix-graph/