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I am writing my thesis on the ACD model of Engle and Russel (1998). Because of the great similarities with GARCH, a common feature is non-degeneracy or non-degeneration. Apparently it is absolute basic knowledge, because I can figure out what non-degeneracy is. The ACD or GARCH process are basically stochastic processes. I would like to know what non-degeneration in context of a stochastic process is.

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    $\begingroup$ It depends on the context. You'll have to look at the source where you saw the term used - maybe they give a definition, or maybe the meaning can be inferred from context. $\endgroup$
    – Nate Eldredge
    Commented May 23, 2021 at 22:02
  • $\begingroup$ I’m voting to close this question because it would be better asked on cross validated. $\endgroup$
    – Mark Wildon
    Commented May 24, 2021 at 10:48

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A nondegenerate stochastic process has a nonzero variance, or equivalently, a nonzero diffusion coefficient.

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