Search Results for author: Elena Zheleva

Found 20 papers, 9 papers with code

Bridging or Breaking: Impact of Intergroup Interactions on Religious Polarization

no code implementations19 Feb 2024 Rochana Chaturvedi, Sugat Chaturvedi, Elena Zheleva

We then use a meta-learning framework to examine heterogeneous treatment effects of intergroup interactions on an individual's group conformity in the light of communal, political, and socio-economic events.

Meta-Learning

Leveraging heterogeneous spillover effects in maximizing contextual bandit rewards

no code implementations16 Oct 2023 Ahmed Sayeed Faruk, Elena Zheleva

However, current approaches ignore potential spillover between interacting users, where the action of one user can impact the actions and rewards of other users.

Multi-Armed Bandits Recommendation Systems

Mitigating Cold-start Forecasting using Cold Causal Demand Forecasting Model

no code implementations15 Jun 2023 Zahra Fatemi, Minh Huynh, Elena Zheleva, Zamir Syed, Xiaojun Di

Our experiments demonstrate that the CDF-cold framework outperforms state-of-the-art forecasting models in predicting future values of multivariate time series data.

Causal Inference Time Series

Contagion Effect Estimation Using Proximal Embeddings

no code implementations4 Jun 2023 Zahra Fatemi, Elena Zheleva

Contagion effect refers to the causal effect of peers' behavior on the outcome of an individual in social networks.

Causal Inference Representation Learning

Inferring Causal Effects Under Heterogeneous Peer Influence

no code implementations27 May 2023 Shishir Adhikari, Elena Zheleva

Heterogeneous peer influence (HPI) occurs when a unit's outcome is influenced differently by different peers based on their attributes and relationships, or when each unit has a different susceptibility to peer influence.

Causal Inference

Data-Driven Estimation of Heterogeneous Treatment Effects

no code implementations16 Jan 2023 Christopher Tran, Keith Burghardt, Kristina Lerman, Elena Zheleva

In this work, we provide a survey of state-of-the-art data-driven methods for heterogeneous treatment effect estimation using machine learning, broadly categorizing them as methods that focus on counterfactual prediction and methods that directly estimate the causal effect.

counterfactual

Learning Relational Causal Models with Cycles through Relational Acyclification

1 code implementation25 Aug 2022 Ragib Ahsan, David Arbour, Elena Zheleva

We introduce relational acyclification, an operation specifically designed for relational models that enables reasoning about the identifiability of cyclic relational causal models.

Causal Discovery

Non-Parametric Inference of Relational Dependence

1 code implementation30 Jun 2022 Ragib Ahsan, Zahra Fatemi, David Arbour, Elena Zheleva

Independence testing plays a central role in statistical and causal inference from observational data.

Causal Inference

Improving Data-driven Heterogeneous Treatment Effect Estimation Under Structure Uncertainty

1 code implementation25 Jun 2022 Christopher Tran, Elena Zheleva

To address this problem, we develop a feature selection method that considers each feature's value for HTE estimation and learns the relevant parts of the causal structure from data.

Decision Making feature selection

Relational Causal Models with Cycles:Representation and Reasoning

no code implementations22 Feb 2022 Ragib Ahsan, David Arbour, Elena Zheleva

To facilitate cycles in relational representation and learning, we introduce relational $\sigma$-separation, a new criterion for understanding relational systems with feedback loops.

Heterogeneous Peer Effects in the Linear Threshold Model

1 code implementation27 Jan 2022 Christopher Tran, Elena Zheleva

The Linear Threshold Model is a widely used model that describes how information diffuses through a social network.

Causal Inference

RGRecSys: A Toolkit for Robustness Evaluation of Recommender Systems

1 code implementation12 Jan 2022 Zohreh Ovaisi, Shelby Heinecke, Jia Li, Yongfeng Zhang, Elena Zheleva, Caiming Xiong

Robust machine learning is an increasingly important topic that focuses on developing models resilient to various forms of imperfect data.

Recommendation Systems

Understanding the Dynamics between Vaping and Cannabis Legalization Using Twitter Opinions

1 code implementation4 Jun 2021 Shishir Adhikari, Akshay Uppal, Robin Mermelstein, Tanya Berger-Wolf, Elena Zheleva

Cannabis legalization has been welcomed by many U. S. states but its role in escalation from tobacco e-cigarette use to cannabis vaping is unclear.

Stance Detection Weakly-supervised Learning

Detecting and understanding moral biases in news

no code implementations WS 2020 Usman Shahid, Barbara Di Eugenio, Andrew Rojecki, Elena Zheleva

We describe work in progress on detecting and understanding the moral biases of news sources by combining framing theory with natural language processing.

Minimizing Interference and Selection Bias in Network Experiment Design

no code implementations15 Apr 2020 Zahra Fatemi, Elena Zheleva

Here, we show that cluster randomization does not ensure sufficient node randomization and it can lead to selection bias in which treatment and control nodes represent different populations of users.

Selection bias

Variable-lag Granger Causality and Transfer Entropy for Time Series Analysis

2 code implementations1 Feb 2020 Chainarong Amornbunchornvej, Elena Zheleva, Tanya Berger-Wolf

We demonstrate our approaches on an application for studying coordinated collective behavior and other real-world casual-inference datasets and show that our proposed approaches perform better than several existing methods in both simulated and real-world datasets.

Causal Inference Dynamic Time Warping +3

Correcting for Selection Bias in Learning-to-rank Systems

no code implementations29 Jan 2020 Zohreh Ovaisi, Ragib Ahsan, Yifan Zhang, Kathryn Vasilaky, Elena Zheleva

Click data collected by modern recommendation systems are an important source of observational data that can be utilized to train learning-to-rank (LTR) systems.

counterfactual Learning-To-Rank +3

Variable-lag Granger Causality for Time Series Analysis

2 code implementations18 Dec 2019 Chainarong Amornbunchornvej, Elena Zheleva, Tanya Y. Berger-Wolf

Typical operationalizations of Granger causality make a strong assumption that every time point of the effect time series is influenced by a combination of other time series with a fixed time delay.

Causal Inference Leadership Inference +2

Learning Triggers for Heterogeneous Treatment Effects

1 code implementation31 Jan 2019 Christopher Tran, Elena Zheleva

The causal effect of a treatment can vary from person to person based on their individual characteristics and predispositions.

Recommendation Systems

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