The Profiles of Individual Radicalization in the United States (PIRUS) project is a database of Islamist, Far Left and Far Right individuals who have radicalized to violent and non-violent extremism in the United States. Wave 1 of the project was completed in August 2013, with more than 600 individuals included in the dataset and 10 in-depth case studies. The analysis for this research brief draws on the Wave 1 dataset observations; it uses indexes measuring various risk factors for radicalization (see "Method" section for more information), as well as individual variables measuring specific conditions or events of interest to those studying radicalization.
Jensen, Michael, Patrick James, and Herbert Tinsley. 2015. "Profiles of Individual Radicalization in the United States: An Empirical Assessment of Domestic Radicalization." January. https://www.start.umd.edu/pubs/PIRUS%20Fact%20Sheet_Jan%202015.pdf