Towards Interpretable and Trustworthy Network-Assisted Prediction

Abstract: When training data points for a prediction algorithm are connected by a network, it creates dependency, which reduces effective sample size but also creates an opportunity to improve prediction by leveraging information from neighbors. Multiple prediction methods on networks taking advantage of this opportunity have been developed, but they are rarely interpretable or have uncertainty measures available. This talk will cover two contributions bridging this gap. One is a conformal prediction method for network-assisted regression. The other is a family of flexible network-assisted models built upon a generalization of random forests (RF+), which both achieves competitive prediction accuracy and can be interpreted through feature importance measures.  Importantly, it allows one to separate the importance of node covariates in prediction from the importance of the network itself. These tools help broaden the scope and applicability of network-assisted prediction to practical applications.  

This talk is based on joint work with Robert Lunde, Tiffany Tang, and Ji Zhu.

Liza Levina is the Vijay Nair Collegiate Professor of Statistics at the University of Michigan, and affiliated faculty at the Michigan Institute for Data and AI in Society and the Center for the Study of Complex Systems. She received her PhD in Statistics from UC Berkeley in 2002, and has been at the University of Michigan since. Her research interests lie in network analysis, high-dimensional statistics, statistical learning, and applications to neuroscience and imaging.  Honors include a fellow of the American Statistical Association, a fellow of the Institute of Mathematical Statistics, a Web of Science Highly Cited Researcher, an IMS Medallion lecturer, and an ICM invited speaker.  

Host: Ran Chen