Search Results for author: Abhik Ghosh

Found 6 papers, 2 papers with code

Robust Principal Component Analysis using Density Power Divergence

no code implementations24 Sep 2023 Subhrajyoty Roy, Ayanendranath Basu, Abhik Ghosh

On the other end of the spectrum, robust PCA algorithms solving principal component pursuit or similar optimization problems have high breakdown, but lack theoretical richness and demand high computational power compared to the M-estimators.

Dimensionality Reduction Fraud Detection

rSVDdpd: A Robust Scalable Video Surveillance Background Modelling Algorithm

1 code implementation22 Sep 2021 Subhrajyoty Roy, Ayanendranath Basu, Abhik Ghosh

In this paper, we present a new video surveillance background modelling algorithm based on a new robust singular value decomposition technique rSVDdpd which takes care of both these issues.

Robust Estimation under Linear Mixed Models: The Minimum Density Power Divergence Approach

no code implementations12 Oct 2020 Giovanni Saraceno, Abhik Ghosh, Ayanendranath Basu, Claudio Agostinelli

Many real-life data sets can be analyzed using Linear Mixed Models (LMMs).

Methodology Applications 62F35, 62J05

Foreground modelling via Gaussian process regression: an application to HERA data

no code implementations13 Apr 2020 Abhik Ghosh, Florent Mertens, Gianni Bernardi, Mário G. Santos, Nicholas S. Kern, Christopher L. Carilli, Trienko L. Grobler, Léon V. E. Koopmans, Daniel C. Jacobs, Adrian Liu, Aaron R. Parsons, Miguel F. Morales, James E. Aguirre, Joshua S. Dillon, Bryna J. Hazelton, Oleg M. Smirnov, Bharat K. Gehlot, Siyanda Matika, Paul Alexander, Zaki S. Ali, Adam P. Beardsley, Roshan K. Benefo, Tashalee S. Billings, Judd D. Bowman, Richard F. Bradley, Carina Cheng, Paul M. Chichura, David R. DeBoer, Eloy de Lera Acedo, Aaron Ewall-Wice, Gcobisa Fadana, Nicolas Fagnoni, Austin F. Fortino, Randall Fritz, Steve R. Furlanetto, Samavarti Gallardo, Brian Glendenning, Deepthi Gorthi, Bradley Greig, Jasper Grobbelaar, Jack Hickish, Alec Josaitis, Austin Julius, Amy S. Igarashi, MacCalvin Kariseb, Saul A. Kohn, Matthew Kolopanis, Telalo Lekalake, Anita Loots, David MacMahon, Lourence Malan, Cresshim Malgas, Matthys Maree, Zachary E. Martinot, Nathan Mathison, Eunice Matsetela, Andrei Mesinger, Abraham R. Neben, Bojan Nikolic, Chuneeta D. Nunhokee, Nipanjana Patra, Samantha Pieterse, Nima Razavi-Ghods, Jon Ringuette, James Robnett, Kathryn Rosie, Raddwine Sell, Craig Smith, Angelo Syce, Max Tegmark, Nithyanandan Thyagarajan, Peter K. G. Williams, Haoxuan Zheng

The key challenge in the observation of the redshifted 21-cm signal from cosmic reionization is its separation from the much brighter foreground emission.

Cosmology and Nongalactic Astrophysics

Robust Generalised Quadratic Discriminant Analysis

no code implementations11 Apr 2020 Abhik Ghosh, Rita SahaRay, Sayan Chakrabarty, Sayan Bhadra

Quadratic discriminant analysis (QDA) is a widely used statistical tool to classify observations from different multivariate Normal populations.

The visibility based Tapered Gridded Estimator (TGE) for the redshifted 21-cm power spectrum

1 code implementation6 Sep 2016 Samir Choudhuri, Somnath Bharadwaj, Suman Chatterjee, Sk. Saiyad Ali, Nirupam Roy, Abhik Ghosh

An earlier version of the 2D TGE for the angular power spectrum $C_{\ell}$ is improved and then extended to obtain the 3D TGE for the power spectrum $P({\bf k})$ of the 21-cm brightness temperature fluctuations.

Cosmology and Nongalactic Astrophysics

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