Columbia HomeSchedule for Fall 2026
Seminars are on Mondays
Time: 4:10 pm - 5:00 pm
Location: Room 903 SSW, 1255 Amsterdam Avenue
| 14-Sept.-26 |
Speaker: Roshni Sahoo (Columbia University) Title: Data Fusion for High-Resolution Estimation Abstract: High-resolution estimates of population health indicators are critical for precision public health. We propose a method for high-resolution estimation that fuses distinct data sources: an unbiased, low-resolution data source (e.g. aggregated administrative data) and a potentially biased, high-resolution data source (e.g. individual-level online survey responses). We assume that the potentially biased, high-resolution data source is generated from the population under a model of sampling bias where observables can have arbitrary impact on the probability of response but the difference in the log probabilities of response between units with the same observables is linear in the difference between sufficient statistics of their observables and outcomes. Our data fusion method learns a distribution that is closest (in the sense of KL divergence) to the online survey distribution and consistent with the aggregated administrative data and our model of sampling bias. This approach significantly reduces bias in high-resolution estimates compared to baselines that rely on a single data source alone on a testbed that includes repeated measurements of three indicators measured by both the (online) Household Pulse Survey and ground-truth data sources at two geographic resolutions over the same time period. Bio: Roshni Sahoo is assistant professor in the Decision, Risk, and Operations Division at Columbia Business School. She works on data-driven decision making for social impact. Her research develops statistical methodology to address challenges in public health and economic development, combining tools from machine learning, causal inference, and optimization. Roshni completed her PhD in Computer Science at Stanford University in 2026. She also received Bachelor of Science degrees in Computer Science and Mathematics at MIT in 2020. |
| 21-Sept.-26 |
Speaker: Rajarshi Mukherjee (Harvard) Title: Abstract: Bio: |
| 28-Sept.-26 |
Speaker: Linjun Zhang (Rutgers) Title: Abstract: Bio: |
| 5-Oct-26 |
Speaker: Eric Kolaczyk ( McGill University) Title: Abstract: Bio: |
| 12-Oct-26 |
Speaker: Siva Balakrishnan (Carnegie Mellon University) Title: Abstract: Bio: |
| 19-Oct-26 |
Speaker: Chen Zhou ( Erasmus University Rotterdam) Title: Abstract: Bio: |
| 26-Oct-26 |
Speaker: TBD Title: Abstract: Bio: |
| 2-Nov-26 |
HOLIDAY |
| 9-Nov-26 |
Speaker: TBD Title: Abstract: Bio: |
| 16-Nov-26 |
Speaker:TBD Title: Abstract: Bio: |
| 23-Nov-26 |
Speaker:TBD Title: Abstract: Bio: |
| 30-Nov-26 |
Speaker: Ilya Shpitser (Johns Hopkins) Title: Abstract: Bio: |
| 7-Dec-26 |
Speaker: Xiaowu Dai (UCLA) Title: Abstract: Bio: |
| 14-Dec-26 |
Speaker: Tracey Ke (Harvard) Title: Abstract: Bio: |
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