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Browsing by Subject "cyclicity"

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  • thumbnail.journal.alt
    Item type:Article, Access status: Open Access ,
    TRIFOUR - program do analizy cykliczności sekwencji dendrochronologicznych
    (Wydawnictwa AGH, 2006) Krawczyk, Andrzej J.
    The paper presents the TRIFOUR software designed for trends and cyclicity analyses of dendrochronological sequences. The software accepts data written in several formats (e.g. TUSCON and CRN). Analysis can be run for the full sequence, for a selected fragment or simultaneously for several selected fragments of data sequence. The software calculates coefficients of polynomial, exponential, involute, hyperbolic, linear and moving-average trends. Current trend estimation can be applied to transformation of analyzed sequence into dendrochronological indexes sequence. Cyclicity analysis includes values of empirical correlation function, periodogram and spectral density. Sequence fragmentation into equal- or random-length parts enables recognition of their variability with the time. Both the sequences and all results are recorded into hard disc as graphic and/or text files.