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ENH: Add NGARCH specification to set of volatility processes  #636

@itsNH98

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@itsNH98

Actually, the "volatility" component of arch includes numerous GARCH specifications, many of them that include the leverage effect. However, it doesn't include the NGARCH of Engle and Ng (1993).

ARCH does include a lot of different models so this addition could seem unnecessary, but it would mostly be for completeness and replication of prior results.

Thanks

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