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Dr. Martin Nweeia began researching narwhals in 2000. He came to the conclusion that the prevailing research available about the narwhal’s tooth — such as Charles Darwin’s belief that the narwhal’s tooth was a secondary sexual characteristic like an antler or a horn — was only part of the story.

Michael Bublé postponed his "An Evening With" tour to 2021 due to the coronavirus pandemic.

Officials want to hear from parents, students and educators in the wake of a newspaper series that said Texas is suppressing special education enrollment.

Paris : Rémont, 1815.

Scott H. Holan, Robert Lund, Ginger Davis

Source: Statist. Surv., Volume 4, 232--274.

Abstract:
Autoregressive moving-average (ARMA) difference equations are ubiquitous models for short memory time series and have parsimoniously described many stationary series. Variants of ARMA models have been proposed to describe more exotic series features such as long memory autocovariances, periodic autocovariances, and count support set structures. This review paper enumerates, compares, and contrasts the common variants of ARMA models in today’s literature. After the basic properties of ARMA models are reviewed, we tour ARMA variants that describe seasonal features, long memory behavior, multivariate series, changing variances (stochastic volatility) and integer counts. A list of ARMA variant acronyms is provided.

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