Search Results for author: Stephen R. Pfohl

Found 8 papers, 4 papers with code

Proxy Methods for Domain Adaptation

no code implementations12 Mar 2024 Katherine Tsai, Stephen R. Pfohl, Olawale Salaudeen, Nicole Chiou, Matt J. Kusner, Alexander D'Amour, Sanmi Koyejo, Arthur Gretton

We study the problem of domain adaptation under distribution shift, where the shift is due to a change in the distribution of an unobserved, latent variable that confounds both the covariates and the labels.

Domain Adaptation

Adapting to Latent Subgroup Shifts via Concepts and Proxies

no code implementations21 Dec 2022 Ibrahim Alabdulmohsin, Nicole Chiou, Alexander D'Amour, Arthur Gretton, Sanmi Koyejo, Matt J. Kusner, Stephen R. Pfohl, Olawale Salaudeen, Jessica Schrouff, Katherine Tsai

We show that the optimal target predictor can be non-parametrically identified with the help of concept and proxy variables available only in the source domain, and unlabeled data from the target.

Unsupervised Domain Adaptation

Net benefit, calibration, threshold selection, and training objectives for algorithmic fairness in healthcare

1 code implementation3 Feb 2022 Stephen R. Pfohl, Yizhe Xu, Agata Foryciarz, Nikolaos Ignatiadis, Julian Genkins, Nigam H. Shah

A growing body of work uses the paradigm of algorithmic fairness to frame the development of techniques to anticipate and proactively mitigate the introduction or exacerbation of health inequities that may follow from the use of model-guided decision-making.

Decision Making Fairness

A comparison of approaches to improve worst-case predictive model performance over patient subpopulations

1 code implementation27 Aug 2021 Stephen R. Pfohl, Haoran Zhang, Yizhe Xu, Agata Foryciarz, Marzyeh Ghassemi, Nigam H. Shah

Predictive models for clinical outcomes that are accurate on average in a patient population may underperform drastically for some subpopulations, potentially introducing or reinforcing inequities in care access and quality.

An Empirical Characterization of Fair Machine Learning For Clinical Risk Prediction

1 code implementation20 Jul 2020 Stephen R. Pfohl, Agata Foryciarz, Nigam H. Shah

The use of machine learning to guide clinical decision making has the potential to worsen existing health disparities.

BIG-bench Machine Learning Decision Making +1

Language Models Are An Effective Patient Representation Learning Technique For Electronic Health Record Data

2 code implementations6 Jan 2020 Ethan Steinberg, Ken Jung, Jason A. Fries, Conor K. Corbin, Stephen R. Pfohl, Nigam H. Shah

Widespread adoption of electronic health records (EHRs) has fueled the development of using machine learning to build prediction models for various clinical outcomes.

Representation Learning

Federated and Differentially Private Learning for Electronic Health Records

no code implementations13 Nov 2019 Stephen R. Pfohl, Andrew M. Dai, Katherine Heller

The use of collaborative and decentralized machine learning techniques such as federated learning have the potential to enable the development and deployment of clinical risk predictions models in low-resource settings without requiring sensitive data be shared or stored in a central repository.

Federated Learning

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