Search Results for author: AmirEmad Ghassami

Found 28 papers, 10 papers with code

Two-Stage Nuisance Function Estimation for Causal Mediation Analysis

no code implementations31 Mar 2024 AmirEmad Ghassami

In this work, we propose a two-stage estimation strategy for the nuisance functions that estimates the nuisance functions based on the role they play in the structure of the bias of the influence function-based estimator of the mediation functional.

Identification and Estimation for Nonignorable Missing Data: A Data Fusion Approach

no code implementations15 Nov 2023 Zixiao Wang, AmirEmad Ghassami, Ilya Shpitser

We consider the task of identifying and estimating a parameter of interest in settings where data is missing not at random (MNAR).

Partial Identification of Causal Effects Using Proxy Variables

no code implementations10 Apr 2023 AmirEmad Ghassami, Ilya Shpitser, Eric Tchetgen Tchetgen

However, completeness is well-known not to be empirically testable, and although a bridge function may be well-defined, lack of completeness, sometimes manifested by availability of a single type of proxy, may severely limit prospects for identification of a bridge function and thus a causal effect; therefore, potentially restricting the application of the proximal causal framework.

Causal Inference

Causal Discovery in Linear Latent Variable Models Subject to Measurement Error

1 code implementation8 Nov 2022 Yuqin Yang, AmirEmad Ghassami, Mohamed Nafea, Negar Kiyavash, Kun Zhang, Ilya Shpitser

We demonstrate a somewhat surprising connection between this problem and causal discovery in the presence of unobserved parentless causes, in the sense that there is a mapping, given by the mixing matrix, between the underlying models to be inferred in these problems.

Causal Discovery

A Unified Experiment Design Approach for Cyclic and Acyclic Causal Models

1 code implementation20 May 2022 Ehsan Mokhtarian, Saber Salehkaleybar, AmirEmad Ghassami, Negar Kiyavash

We study experiment design for unique identification of the causal graph of a simple SCM, where the graph may contain cycles.

Combining Experimental and Observational Data for Identification and Estimation of Long-Term Causal Effects

no code implementations26 Jan 2022 AmirEmad Ghassami, Alan Yang, David Richardson, Ilya Shpitser, Eric Tchetgen Tchetgen

We consider the task of identifying and estimating the causal effect of a treatment variable on a long-term outcome variable using data from an observational domain and an experimental domain.

Causal Inference

Causal Inference with Hidden Mediators

1 code implementation4 Nov 2021 AmirEmad Ghassami, Alan Yang, Ilya Shpitser, Eric Tchetgen Tchetgen

In this paper, we extend the proximal causal inference approach to settings where identification of causal effects hinges upon a set of mediators which are not observed, yet error prone proxies of the hidden mediators are measured.

Causal Inference

Causal Discovery in Linear Structural Causal Models with Deterministic Relations

1 code implementation30 Oct 2021 Yuqin Yang, Mohamed Nafea, AmirEmad Ghassami, Negar Kiyavash

Linear structural causal models (SCMs)-- in which each observed variable is generated by a subset of the other observed variables as well as a subset of the exogenous sources-- are pervasive in causal inference and casual discovery.

Causal Discovery Causal Inference

Partially Intervenable Causal Models

no code implementations24 Oct 2021 AmirEmad Ghassami, Ilya Shpitser

We give a complete identification theory for such models, and develop a complete calculus of interventions based on a generalization of the do-calculus, and axioms that govern probabilistic operations on Markov kernels.

Causal Inference

Recursive Causal Structure Learning in the Presence of Latent Variables and Selection Bias

1 code implementation NeurIPS 2021 Sina Akbari, Ehsan Mokhtarian, AmirEmad Ghassami, Negar Kiyavash

The upper bound of our proposed approach and the lower bound at most differ by a factor equal to the number of variables in the worst case.

Selection bias

Information Theoretic Measures for Fairness-aware Feature Selection

no code implementations1 Jun 2021 Sajad Khodadadian, Mohamed Nafea, AmirEmad Ghassami, Negar Kiyavash

In particular, we first propose information theoretic measures which quantify the impact of different subsets of features on the accuracy and discrimination of the decision outcomes.

Decision Making Fairness +1

Multiply Robust Causal Mediation Analysis with Continuous Treatments

no code implementations19 May 2021 Numair Sani, Yizhen Xu, AmirEmad Ghassami, Ilya Shpitser

For binary treatments, efficient estimators for the direct and indirect effects are presented in Tchetgen Tchetgen and Shpitser (2012) based on the influence function of the parameter of interest.

Minimax Kernel Machine Learning for a Class of Doubly Robust Functionals with Application to Proximal Causal Inference

1 code implementation7 Apr 2021 AmirEmad Ghassami, Andrew Ying, Ilya Shpitser, Eric Tchetgen Tchetgen

In this paper, we first extend the class of Robins et al. to include doubly robust IFs in which the nuisance functions are solutions to integral equations.

BIG-bench Machine Learning Causal Inference +1

Impact of Data Processing on Fairness in Supervised Learning

no code implementations3 Feb 2021 Sajad Khodadadian, AmirEmad Ghassami, Negar Kiyavash

Finally, we show that by appropriate choice of the discrimination measure, the optimization problem for both pre and post processing approaches will reduce to a linear program and hence can be solved efficiently.

Fairness

A Recursive Markov Boundary-Based Approach to Causal Structure Learning

1 code implementation10 Oct 2020 Ehsan Mokhtarian, Sina Akbari, AmirEmad Ghassami, Negar Kiyavash

In this paper, we propose a novel recursive constraint-based method for causal structure learning that significantly reduces the required number of CI tests compared to the existing literature.

On the Role of Sparsity and DAG Constraints for Learning Linear DAGs

1 code implementation NeurIPS 2020 Ignavier Ng, AmirEmad Ghassami, Kun Zhang

Extensive experiments validate the effectiveness of our proposed method and show that the DAG-penalized likelihood objective is indeed favorable over the least squares one with the hard DAG constraint.

Model-Augmented Estimation of Conditional Mutual Information for Feature Selection

1 code implementation12 Nov 2019 Alan Yang, AmirEmad Ghassami, Maxim Raginsky, Negar Kiyavash, Elyse Rosenbaum

In the second step, CI testing is performed by applying the $k$-NN conditional mutual information estimator to the learned feature maps.

feature selection

Characterizing Distribution Equivalence and Structure Learning for Cyclic and Acyclic Directed Graphs

1 code implementation ICML 2020 AmirEmad Ghassami, Alan Yang, Negar Kiyavash, Kun Zhang

The main approach to defining equivalence among acyclic directed causal graphical models is based on the conditional independence relationships in the distributions that the causal models can generate, in terms of the Markov equivalence.

Interventional Experiment Design for Causal Structure Learning

no code implementations12 Oct 2019 AmirEmad Ghassami, Saber Salehkaleybar, Negar Kiyavash

For this case, we propose an efficient exact algorithm for the worst-case gain setup, as well as an approximate algorithm for the average gain setup.

Learning Linear Non-Gaussian Causal Models in the Presence of Latent Variables

no code implementations11 Aug 2019 Saber Salehkaleybar, AmirEmad Ghassami, Negar Kiyavash, Kun Zhang

It can be shown that causal effects among observed variables cannot be identified uniquely even under the assumptions of faithfulness and non-Gaussianity of exogenous noises.

Multi-domain Causal Structure Learning in Linear Systems

no code implementations NeurIPS 2018 Amiremad Ghassami, Negar Kiyavash, Biwei Huang, Kun Zhang

We study the problem of causal structure learning in linear systems from observational data given in multiple domains, across which the causal coefficients and/or the distribution of the exogenous noises may vary.

REORDER: Securing Dynamic-Priority Real-Time Systems Using Schedule Obfuscation

no code implementations4 Jun 2018 Chien-Ying Chen, Monowar Hasan, AmirEmad Ghassami, Sibin Mohan, Negar Kiyavash

The deterministic (timing) behavior of real-time systems (RTS) can be used by adversaries - say, to launch side channel attacks or even destabilize the system by denying access to critical resources.

Cryptography and Security

Counting and Sampling from Markov Equivalent DAGs Using Clique Trees

no code implementations5 Feb 2018 AmirEmad Ghassami, Saber Salehkaleybar, Negar Kiyavash, Kun Zhang

In this paper, we propose a new technique for counting the number of DAGs in a Markov equivalence class.

Causal Inference

Fairness in Supervised Learning: An Information Theoretic Approach

no code implementations13 Jan 2018 AmirEmad Ghassami, Sajad Khodadadian, Negar Kiyavash

To ensure fairness and generalization simultaneously, we compress the data to an auxiliary variable, which is used for the prediction task.

Attribute Decision Making +1

Budgeted Experiment Design for Causal Structure Learning

no code implementations ICML 2018 AmirEmad Ghassami, Saber Salehkaleybar, Negar Kiyavash, Elias Bareinboim

We study the problem of causal structure learning when the experimenter is limited to perform at most $k$ non-adaptive experiments of size $1$.

Learning Causal Structures Using Regression Invariance

no code implementations NeurIPS 2017 AmirEmad Ghassami, Saber Salehkaleybar, Negar Kiyavash, Kun Zhang

We study causal inference in a multi-environment setting, in which the functional relations for producing the variables from their direct causes remain the same across environments, while the distribution of exogenous noises may vary.

Causal Inference regression

Optimal Experiment Design for Causal Discovery from Fixed Number of Experiments

no code implementations27 Feb 2017 AmirEmad Ghassami, Saber Salehkaleybar, Negar Kiyavash

We study the problem of causal structure learning over a set of random variables when the experimenter is allowed to perform at most $M$ experiments in a non-adaptive manner.

Causal Discovery

Interaction Information for Causal Inference: The Case of Directed Triangle

no code implementations30 Jan 2017 AmirEmad Ghassami, Negar Kiyavash

Interaction information is one of the multivariate generalizations of mutual information, which expresses the amount information shared among a set of variables, beyond the information, which is shared in any proper subset of those variables.

Causal Inference

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