Complex scalings for categorical time series
Georgi N. Boshnakov, I Partchev · Research Explorer (The University of Manchester) · 1995
The spectral envelope has been introduced recently as a means for harmonic analysis of categorical time series. The associated scalings of the categories are real. The aim of this note is to give some arguments that simpler theory can be achieved by allowing for complex scalings. The complex values seem to enrich the interpretation of the scalings.