# Searching for Biological Rhythms: Peak Detection in the Periodogram of Unequally Spaced Data

@article{VanDongen1999SearchingFB, title={Searching for Biological Rhythms: Peak Detection in the Periodogram of Unequally Spaced Data}, author={Hans P. A. Van Dongen and Erik Olofsen and J H VanHartevelt and E. W. Kruyt}, journal={Journal of Biological Rhythms}, year={1999}, volume={14}, pages={617 - 620} }

The classical power spectrum, computed in the frequency domain, outranks traditionally used periodograms derived in the time domain (such as the [.chi]2 periodogram) regarding the search for biological rhythms. Unfortunately, classical power spectral analysis is not possible with unequally spaced data (e.g., time series with missing data). The Lomb-Scargle periodogram fixes this shortcoming. However, peak detection in the Lomb-Scargle periodogram of unequally spaced data requires some careful…

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