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. 2014 Apr 11;11:16. doi: 10.1186/1742-4682-11-16

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Copyright © 2014 Cornelissen; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Elliptical confidence limits. The outer ellipse delineates the 95% confidence region for the joint estimation of the amplitude and acrophase (as a pair). Distances and tangents drawn from the pole to this outer ellipse yield conservative 95% confidence limits for the amplitude and acrophase considered separately as the area thus delineated is larger than the area of the outer ellipse. In order to obtain separate 95% confidence limits for the amplitude and acrophase, distances and tangents need to be drawn to a somewhat smaller (inner) ellipse. For further details, see [43]. © Halberg Chronobiology Center.