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The ambiguities we discuss are of various kinds: In section 2, we illustrate some consequences for signal extraction of inappropriately using 'parsimony' to remove the ambiguity inherent in the selection of an ARMA model for an unobserved component of a stationary ARMA (p,p) process when only the spectrum of the observed process is known. In the remaining sections, we mainly look at consequences for various applications of only knowing a finite segment.
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