Search Results for author: Abolfazl Safikhani

Found 4 papers, 0 papers with code

A Unified Framework for Fast Large-Scale Portfolio Optimization

no code implementations22 Mar 2023 Weichuan Deng, Pawel Polak, Abolfazl Safikhani, Ronakdilip Shah

We introduce a unified framework for rapid, large-scale portfolio optimization that incorporates both shrinkage and regularization techniques.

Portfolio Optimization

Theoretical analysis of deep neural networks for temporally dependent observations

no code implementations20 Oct 2022 Mingliang Ma, Abolfazl Safikhani

Despite the widespread use of neural networks in such settings, most theoretical developments of deep neural networks are under the assumption of independent observations, and theoretical results for temporally dependent observations are scarce.

Time Series Time Series Analysis

Estimation of High-Dimensional Markov-Switching VAR Models with an Approximate EM Algorithm

no code implementations14 Oct 2022 Xiudi Li, Abolfazl Safikhani, Ali Shojaie

To overcome these challenges, in this paper we propose an approximate EM algorithm for Markov-switching VAR models that leads to efficient computation and also facilitates the investigation of asymptotic properties of the resulting parameter estimates.

Time Series Time Series Analysis

Inference on the change point in high dimensional time series models via plug in least squares

no code implementations3 Jul 2020 Abhishek Kaul, Stergios B. Fotopoulos, Venkata K. Jandhyala, Abolfazl Safikhani

We study a plug in least squares estimator for the change point parameter where change is in the mean of a high dimensional random vector under subgaussian or subexponential distributions.

Time Series Time Series Analysis

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