See my new site at scholar.princeton.edu/bstewart
I am a PhD student in Harvard University's Department of Government. My work centers on the use of statistical methods for measuring complex political and social phenomena with a particular interest in international relations.
My recent work is on Latent Factor Regressions which provide a general framework for modeling dependent data. The framework covers numerous data types including grouped/multilevel, time-series cross-sectional, spatial and network data, all with a single approach. While previous proposals in the literature can take days to estimate a single model, estimation under my framework often takes less than a second. In the near future I will release an R package implementing these new methods.
Molly Roberts, Dustin Tingley, and I have released the R package stm which estimates the Structural Topic Model along with tools for plotting, covariate analysis and more. See the page here. The package is also available on CRAN- just use install.packages("stm"). Antonio Coppola and I have released a new R package lbfgs for optimization using L1 penalties. The package is available on CRAN. Both packages also come with full vignettes explaining the full range of features they offer.
One of my favorite parts of research is being able to work with a diverse group of scholars. I am fortunate to have a number of wonderful collaborators. I am currently working with Molly Roberts and Dustin Tingley on developing the Structural Topic Model (STM), an unsupervised topic model geared towards inference in the social sciences. Our paper on using STM for analyzing open-ended survey response was published in the American Journal of Political Science and was awarded the Gosnell Prize for excellence in political methodology. I am also working on developing Consilience, an interface for computer-assisted reading (with Merce Crosas, Justin Grimmer and Gary King). An early summary of ongoing work with Daniel Young on measuring constitutional moments was recently published by the Yale Law Journal (see a browser of our results here). Brendan O'Connor and I have been working on methods for learning types of international events in large bodies of text. Finally, I am continuing ongoing work on transnational crime (with Paulette Lloyd and Beth Simmons).
You can find preprints of my publications on this site and on Google Scholar.