Background real-world networks such as social and communication networks are too large
to be observed entirely. Such networks are often partially observed such that network size …

Real-world phenomena are often partially observed. This partial observability leads to
incomplete data. Acquiring more data is often expensive, hard, or impossible. We present a …

This dissertation answers three questions on identifiability and estimability that arise in
policy-making and causal discovery. First, we study contact tracing as a tool to prevent the …

In recent years, researchers have increasingly used OSN data to study human behavior.
Before such a study can begin, one must first obtain appropriate data. A platform, eg …