118 citations · 689 across the 53 of their papers we have counts for
4 papers · 1 filter
Iterative Thresholding Algorithm for Sparse Inverse Covariance Estimation
Dominique Guillot, Bala Rajaratnam, Benjamin T. Rolfs +2
The L1-regularized maximum likelihood estimation problem has recently become a topic of great interest within the machine learning, statistics, and optimization communities as a me…
Functions preserving positive definiteness for sparse matrices
Dominique Guillot, Bala Rajaratnam
We consider the problem of characterizing entrywise functions that preserve the cone of positive definite matrices when applied to every off-diagonal element. Our results extend th…
Successive Standardization of Rectangular Arrays
Richard A. Olshen, Bala Rajaratnam
In this note we illustrate and develop further with mathematics and examples, the work on successive standardization (or normalization) that is studied earlier by the same authors…
Positive definite completion problems for directed acyclic graphs
Emanuel Ben-David, Bala Rajaratnam
A positive definite completion problem pertains to determining whether the unspecified positions of a partial (or incomplete) matrix can be completed in a desired subclass of posit…