Two problems in the subject of time-series analysis are considered: (A) the effect of fluctuating variances on the periodogram of a set of independent Gaussian data with zero means; (B) the ...

The WEIGHTS statement specifies the relative weights used in the moving average applied to the periodogram ordinates to form the spectral density estimates. A WEIGHTS statement must be used to produce ...

The periodogram for a spatial process observed on a lattice is often used to estimate the spectral density. The bases for such estimators are two asymptotic properties that periodograms commonly ...

THIELE et al. 1 have provided many examples of partially periodic precipitation phenomena, some of which resemble in a surprising manner the patterns found in tissues. The analysis of these patterns ...