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periodogram |
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periodogram [‚pir·ē′äd·ə‚gram] (statistics) A graph used in harmonic analysis of a series that oscillates, such as a time series consisting potentially of several cycles differing in length; the square of the amplitude or intensity for each curve covering a length of time is plotted against the lengths of the various curves. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| 40 Hz), and LF:HF ratio, which were calculated by Welch's averaged periodogram of the NN intervals (Task Force 1996; Welch 1967). An investigation into the periodicity of measles epidemics in London from 1703 to the present day by the method of the periodogram. Chirot's (1991) periodogram of technological ages may offer an idea concerning the quality and the level of technological development reached by individual countries. |
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