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Softplus Affine(1, 1) Processes: Enlarged Stationarity Region, Stationary Unit Roots, and Inference

Lu, Yang et al.
arXiv (All) · Papers
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statistics-theory
Softplus affine\((1,1)\) models keep the conditional mean positive while allowing coefficients of either sign. We study them under Poisson, negative binomial, gamma and related conditional distributions. A stationary solution with moments of all positive orders exists whenever the coefficient sum is
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