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# Robust Mean Estimation on Highly Incomplete Data with Arbitrary Outliers

*Proceedings of The 24th International Conference on Artificial Intelligence and Statistics*, PMLR 130:1558-1566, 2021.

#### Abstract

We study the problem of robustly estimating the mean of a $d$-dimensional distribution given $N$ examples, where most coordinates of every example may be missing and $\varepsilon N$ examples may be arbitrarily corrupted. Assuming each coordinate appears in a constant factor more than $\varepsilon N$ examples, we show algorithms that estimate the mean of the distribution with information-theoretically optimal dimension-independent error guarantees in nearly-linear time $\widetilde O(Nd)$. Our results extend recent work on computationally-efficient robust estimation to a more widely applicable incomplete-data setting.