Porównanie wybranych metod detekcji cykliczności procesów losowych na przykładzie różnych szeregów czasowych. Cz. 2, obszar częstotliwościowy

Over the last decades there has been a great increase of methods and techniques used for investigation of periodic structure of climatologic processes, caused by vital importance to be able to determinate climatic changes. As the conventional methods and their modification as new computational techniques, differ between one another on the effectiveness and accuracy of results. In the paper there are presented two traditional methods applied in frequency domain for detection of periodicity in time series: periodogram and spectral density function together with suitable statistical procedures for verification of periods detected. The methods were shown in their applications to various real data sets.