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Use behavioural variables to compute period, rhythmicity and other circadian parameters. Methods include computation of chi square periodograms (Sokolove and Bushell (1978) doi:10.1016/0022-5193(78)90022-X), Lomb-Scargle periodograms (Lomb (1976) doi:10.1007/BF00648343, Scargle (1982) doi:10.1086/160554, Ruf (1999) doi:10.1076/brhm.30.2.178.1422), and autocorrelation-based periodograms.

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