Abstract
In this paper we derive the asymptotic properties of the least squares estimator (LSE) of fractionally integrated autoregressive moving-average (FARIMA) models under the assumption that the errors are uncorrelated but not necessarily independent nor martingale differences. We relax the independence and even the martingale difference assumptions on the innovation process to extend considerably the range of application of the FARIMA models. We propose a consistent estimator of the asymptotic covariance matrix of the LSE which may be very different from that obtained in the standard framework. A self-normalized approach to confidence interval construction for weak FARIMA model parameters is also presented. All our results are done under a mixing assumption on the noise. Finally, some simulation studies and an application to the daily returns of stock market indices are presented to corroborate our theoretical work.
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Notes
To cite few examples of nonlinear processes, let us mention the self-exciting threshold autoregressive (SETAR), the smooth transition autoregressive (STAR), the exponential autoregressive (EXPAR), the bilinear, the random coefficient autoregressive (RCA), the functional autoregressive (FAR) (see Tong (1990) and Fan and Yao (2008) for references on these nonlinear time series models).
Recall that the fractional version of Cesàro’s Lemma states that for \((h_t)_t\) a sequence of positive reals, \(\kappa >0\) and \(c\ge 0\) we have
$$\begin{aligned} \lim _{t\rightarrow \infty }h_tt^{1-\kappa }=\left| \kappa \right| c \Rightarrow \lim _{n\rightarrow \infty }\frac{1}{n^{\kappa }}\sum _{t=0}^n h_t=c. \end{aligned}$$
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Boubacar Maïnassara, Y., Esstafa, Y. & Saussereau, B. Estimating FARIMA models with uncorrelated but non-independent error terms. Stat Inference Stoch Process 24, 549–608 (2021). https://doi.org/10.1007/s11203-021-09243-7
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DOI: https://doi.org/10.1007/s11203-021-09243-7
Keywords
- Nonlinear processes
- FARIMA models
- Least-squares estimator
- Consistency
- Asymptotic normality
- Spectral density estimation
- Self-normalization
- Cumulants