Methodology

2011. Does Blocking Reduce Attrition Bias? Newsletter of the Experimental Section of the American Political Science Association. Forthcoming May 2011.

2010. Instrumental Variables. Prepared for inclusion in the International Encyclopedia of Political Science.

2010. Natural Experiments. Prepared for inclusion in the International Encyclopedia of Political Science.

2010. Design-Based Inference: Beyond the Pitfalls of Regression Analysis? In David Collier and Henry Brady, eds., Rethinking Social Inquiry: Diverse Tools, Shared Standards. Lanham, MD: Rowman & Littlefield, 2nd edition.

2008. Model Specification in Instrumental-Variables Regression. Political Analysis 16 (3): 290-302. Online version published as doi:10.1093/pan/mpm039 (February 10, 2008). The preprint version is also available here; simulations discussed in the article are here. Stata code for the simulations is in a rich-text format file here.

2008. Improving Causal Inference: Strengths and Limitations of Natural Experiments. Political Research Quarterly 61 (2): 282-293. Online version is also available here (October 3, 2007).

2008. The Analysis of Experimental Data: Comparing Techniques. Working paper (with Susan Hyde). Presented at the annual meetings of the American Political Science Association, Boston, MA, August 29-September 1, 2008.

2008.Natural and Field Experiments: The Role of Qualitative Methods. Qualitative Methods 6 (2) (Newsletter of the American Political Science Association’s Organized Section on Qualitative Methods).

2008. Review of John Gerring, Case Study Research: Principles and Practices, Cambridge University Press. 2008. In The Journal of Politics, 70 (1): 282-83. Advance version online as doi:10.1017/S0022381607080243.

2007. Modeling Selection Effects. In William Outhwaite and Stephen P. Turner, eds., The SAGE Handbook of Social Science Methodology. London: Sage Publications (with David Freedman).

2007. The Role of Iteration in Multi-Method Research. Qualitative Methods (Newsletter of the American Political Science Association’s Organized Section on Qualitative Methods), 5 (1). Click here to see the complete symposium on multi-method research and here to see the entire issue of the newsletter.

2007. Report to a committee of the National Academy of Sciences on improving USAID program evaluation: Field memos from Peru. . The committee’s full report is available online here.