##### Department of Mathematics,

University of California San Diego

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### Math Colloquium

## Michael Celentano

#### UC Berkeley

## Debiasing in the inconsistency regime

##### Abstract:

In this talk, I will discuss semi-parametric estimation when nuisance parameters cannot be estimated consistently, focusing in particular on the estimation of average treatment effects, conditional correlations, and linear effects under high-dimensional GLM specifications. In this challenging regime, even standard doubly-robust estimators can be inconsistent. I describe novel approaches which enjoy consistency guarantees for low-dimensional target parameters even though standard approaches fail. For some target parameters, these guarantees can also be used for inference. Finally, I will provide my perspective on the broader implications of this work for designing methods which are less sensitive to biases from high-dimensional prediction models.

### January 8, 2024

### 4:00 PM

APM 6402 (Halkin room)

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