Methods & Data

Specifying and interpreting basic interactions in Stata.
1. Slides from workshop at University of Kentucky.
2. Data for examples in the slides.
3. Related information on Brambor, Clark, and Golder's webpage.
4. More related information on Branton's webpage.

dursel: a Stata utility to estimate duration models with selection.
1. Version: DURSEL 2.0 - updated November 04, 2009.
2. Installation: To install, download the zip file or open Stata and type:
   net from http://myweb.uiowa.edu/fboehmke/stata/dursel
3. Sample data for running DURSEL (data used in the Stata help file).

sudcd: a Stata utility for estimating seemingly unrelated discrete-choice duration models.
1. Version: sudcd 1.1 - released March 09, 2008.
2. Installation: To install, open Stata and type:
   net from http://myweb.uiowa.edu/fboehmke/stata/sudcd

precalc: a Stata utility for calculating the proportional reduction in error for a binary model.
1. Version: precalc 1.0 - updated March 13, 2006.
2. Installation: To install, open Stata and type:
   net from http://myweb.uiowa.edu/fboehmke/stata/precalc

grinter: a Stata utility for graphing the marginal effect of an interacted variable in regression models.
1. Version: grinter 1.8 - updated August 20, 2008.
2. Installation: To install, open Stata and type:
   net from http://myweb.uiowa.edu/fboehmke/stata/grinter

plotfds: a Stata utility for plotting first differences (acts as a CLARIFY frontend).
1. Version: plotfds 1.1 - updated December 16, 2008.
2. Installation: To install, open Stata and type:
   net from http://myweb.uiowa.edu/fboehmke/stata/plotfds
3. Requires CLARIFY suite of commands (Tomz, Wittenberg, and King 2003).

Frederick J. Boehmke and Richard Witmer. 2012. "Indian Nations as Interest Groups Tribal Motivations for Contributions to U.S. Senators." Political Research Quarterly 65 (1): 179-191.

1. Access to the article (here's a preprint version).
2. Preprint and replication files.

Shannon, Megan; Daniel S. Morey and Frederick J. Boehmke. 2010. "The Influence of International Organizations on Militarized Dispute Initiation and Duration." International Studies Quarterly 54: 1123-1141.

1. Access to the article (here's a preprint version).
2. Preprint, imputed data, and replication files (updated on July 12, 2011 to include pre-imputation data as well as our imputed data).

Boehmke, Frederick J. and Daniel C. Bowen. 2010. "Direct Democracy and Individual Interest Group Membership." The Journal of Politics 72(3): 659-671.

1. Access to the article (here's a preprint version).
2. Preprint, (public) data, and replication files (coming soon, though without identifiers).

Boehmke, Frederick J. 2009. "Policy Emulation or Policy Convergence? Potential Ambiguities in the Dyadic Event History Approach to State Policy Emulation." The Journal of Politics 71(3): 1125-1140.

1. Access to the article (here's a preprint version).
2. Preprint, data, and replication files.
3. Preprint, data, Monte Carlo, and replication files (added December, 2011).

Boehmke, Frederick J. 2009. "Approaches to Modeling the Adoption and Modification of Policies with Multiple Components." State Politics and Policy Quarterly 9(2): 229-252.

1. Access to the article (here's a preprint version).
2. Preprint, data, and replication files for analysis of state pain management policy.

Boehmke, Frederick J. 2008. "The Initiative Process and the Dynamics of State Interest Group Populations." State Politics and Policy Quarterly 8(4): 362-383.

1. Access to the article (here's a preprint version).
2. Preprint, data, and replication files.

Boehmke, Frederick J. 2006. "The Influence of Unobserved Factors on Position Timing and Content in the NAFTA Vote." Political Analysis 14 (4): 421-438.

1. Access to the article and supplemental material.
2. Data and replication files (locally hosted - same as on PA web site).
3. Data and replication files (updated to utilize sudcd Stata utility for estimation; generates identical results).
4. To install sudcd, a Stata utility to estimate seemingly unrelated discrete-choice duration models, see Stata Utilities section.

Alvarez R. Michael, Frederick J. Boehmke, and Jonathan Nagler. 2006. "Strategic Voting in Multiparty Elections." Electoral Studies 25 (March 2006): 1-19.

1. Final version of the paper. Here's a preprint version.
2. Data, replication files for GAUSS and Stata, and preprint.

Boehmke, Frederick J. Daniel S. Morey and Megan Shannon. 2006. "Selection Bias and Continuous-Time Duration Models: Consequences and a Proposed Solution." American Journal of Political Science 50 (1): 192-207.

1. Final version of the paper.
2. Data, replication files, and Monte Carlo code (updated with Monte Carlo on April 18, 2007).
3. To install DURSEL, a Stata utility to estimate duration models with selection, see Stata Utilities section.

Boehmke, Frederick J. 2005. "Sources of Variation in the Frequency of Statewide Initiatives: The Role of Interest Group Populations." Political Research Quarterly 58 (4): 575-585.

1. Published version of the paper.
2. Data and replication files. (Data on the frequency of statewide initiatives, 1976-2000).

Boehmke, Frederick J. and Richard Witmer 2004. "Disentangling Diffusion: The Effects of Social Learning and Economic Competition on State Policy Innovation and Expansion." Political Research Quarterly 57 (1): 39-51.

1. Published version of the paper.
2. Data and replication files. (Data on state and Indian nation gaming compacts).

Boehmke, Frederick J. 2003. "Using Auxiliary Data to Estimate Selection Bias Models, With an Application to Interest Group Use of the Direct Initiative Process." Political Analysis: Volume 11 (Summer 2003): 234-254.

1. Access to the article and its web appendix.
2. Sample Monte Carlo file.
3. Stata 8 dataset. (Data from survey on interest group use of the initiative process).