Research

Working Papers/Preprints 

• Covariance operator estimation via adaptive thresholding.
  Omar Al-Ghattas, Daniel Sanz-Alonso
  [ arXiv ]

• A First Course in Monte Carlo Methods.
  Daniel Sanz-Alonso, Omar Al-Ghattas
  [ arXiv ]

• Covariance operator estimation: sparsity, lengthscale, and ensemble Kalman filters.
  Omar Al-Ghattas, Jiaheng Chen, Daniel Sanz-Alonso, Nathan Waniorek
  [ arXiv ]

Publications

• Ensemble Kalman Filters with Resampling.
  Omar Al-Ghattas, Jiajun Bao, Daniel Sanz-Alonso
  SIAM/ASA Journal on Uncertainty Quantification, 12(2) 411-441 (2024)
  [ Journal ], [ arXiv ], [ Code ]

• Non-asymptotic analysis of ensemble Kalman filters: effective dimension and localization.
  Omar Al-Ghattas, Daniel Sanz-Alonso
  Information and Inference: A Journal of the IMA, 13(1), 1-66, (2024)
  [ Journal ], [ arXiv ]

• Exposed soil and mineral map of the Australian continent revealing the land at its barest.
  Dale Roberts, John Wilford, Omar Al-Ghattas
  Nature Communications 10(1), 5297, (2019)
  [ Journal ]

• Disentangled behavioural representations.
  Amir Dezfouli, Hassan Ashtiani, Omar Al-Ghattas, Richard Nock, Peter Dayan, Cheng Soon Ong
  Neural Information Processing Systems (Neurips), (2019)
  [ Conference ], [ Code ]

• Limits of use of social media for monitoring biosecurity events.
  Marijke Welvaert, Omar Al-Ghattas, Mark Cameron, Peter Caley
  PloS one 12(2), e0172457, (2017)
  [ Journal ]