f41"> The US Energy Information Administration (2014) State Energy Data System (SEDS): 1960-2012. http://www.eia.gov/state/seds/seds-data-complete.cfm?sid=US [42] Mendenhall, W. and Sincich, T. (2011) A Second Course in Statistics: Regression Analysis. Prentice Hall, Upper Saddle River. [43] Daniel, W.W. (2000) Applied Nonparametric Statistics. Cengage Learning, Boston.

  
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