isadoranun / FATS

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added Structure Function #1

Closed jorgemarpa closed 8 years ago

jorgemarpa commented 8 years ago

Adding Structure Function from Simonetti et al. 1984. I add 3 different features calculated as the slope between structure function with several exponents, this features has been used to classify quasars. The unit test for this feature is based on random walk, if one time series behave like random walk process each index will have bounded values.