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Periodogram
The periodogram was developed based on the Sokolove Matlab function which
in turn was created based on the work entitled "The Chi Square Periodogram:
Its Utility for Analysis of Circadian Rhythms" of Sokolove and Bushell, 1978.
The periodogram is calculated based on the following formula:
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[∑
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The function was modified to compute the values between the range 0 and 1,
and was developed based on the following work:
Sokolove, Phillip G., and Wayne N. Bushell. "The chi square periodogram: its
utility for analysis of circadian rhythms." Journal of Theoretical Biology 72.1
(1978): 131-160.
