45 citations · 202 across the 24 of their papers we have counts for
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math.ST2014
Mean and variance estimation in high-dimensional heteroscedastic models with non-convex penalties
James Sharpnack, Mladen Kolar
Despite its prevalence in statistical datasets, heteroscedasticity (non-constant sample variances) has been largely ignored in the high-dimensional statistics literature. Recently,…
stat.ML2014★ 30 cited
Trend Filtering on Graphs
Yu-Xiang Wang, James Sharpnack, Alex Smola +1
We introduce a family of adaptive estimators on graphs, based on penalizing the norm of discrete graph differences. This generalizes the idea of trend filtering [Kim et al…
math.ST2014
Exact Asymptotics for the Scan Statistic and Fast Alternatives
James Sharpnack, Ery Arias-Castro
We consider the problem of detecting a rectangle of activation in a grid of sensors in d-dimensions with noisy measurements. This has applications to massive surveillance projects…