Thought this might help a few who are beginning to explore this topic and as questions are raised.

http://www.eia.doe.gov/oiaf/analysispaper/henryhub/index.html

"The percent difference appears to be a better measure of the relationship between the two prices than does the actual difference, because (1) the mean and median values of the percent difference are in close agreement, indicating a more symmetric distribution of observations; (2) the magnitude of the standard deviation is lower, indicating a narrower distribution of observations around the mean; and (3) the percent difference relationship can be evaluated without translating nominal prices into real (constant dollar) prices."

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