The first one, works extremely well when the observations are grouped, after standardization (see eq. 1), around 0 or 1, but may present instability or definition problems when data is concentrated around 0.5.
However, the spectrogram plots (see Fig. 10) reveal that the main frequency content for syllables of class 1, 2, and 4 is concentrated around 3 kHz, while the syllables of class 3 have the main concentration around 4 kHz.
Another mystery is why the heat is concentrated around the south pole.
It is concentrated around major metropolitan areas, particularly on the East and West Coasts.
Europium apparently is concentrated around one magnetic pole, chromium around the other.
Most of Idaho's population is concentrated around Boise in Ada County.
Industry is concentrated around the port cities of Toronto and Hamilton, Ont., and Rochester, N.Y.
Yokohama's business district, containing many important banks and other businesses, is concentrated around the port.
Industrial development of the river basin is concentrated around Ciudad Guayana and includes the production of steel, aluminum, and paper.
Industrial development is concentrated around Batumi, the terminus of a pipeline from Baku on the Caspian Sea.
Industry outside Dublin city is quite limited and is concentrated around Bulriggan, Dublin city, Dún Laoghaire, and Skerries.
