This paper reports on software developed to compute least-squares spectra over a specified interval. This approach facilitates the viewing of a changing time structure in non-stationary time series, smaller than the observation span. The programme is illustrated by a case of solar activity, gauged by yearly Wolf numbers, for the 1700-1999 span that shows the presence of a very unstable component with a period of around-100 years and an about-11-year solar cycle. This method, although demostrated here on a geophysical example, has a broad scope of applications in biology and medicine.
|Original language||English (US)|
|Number of pages||6|
|Journal||Scripta Medica Facultatis Medicae Universitatis Brunensis Masarykianae|
|State||Published - Dec 1 2003|
- Least-squares spectra
- Rhythm analysis