In a criticism of Pape's link between occupation and suicide terrorism, an article titled "Design, Inference, and the Strategic Logic of Suicide Terrorism" (published in "The American Political Science Review"), authors Scott Ashworth, Joshua D. Clinton, Adam Meirowitz, and Kristopher W. Ramsay from Princeton charge Pape with "sampling on the dependent variable" by limiting research only to cases in which suicide terror was used: Pape's analysis has no control group. Appendix II lists 58 occupations by democracies, only 9 of which generated suicide terrorism. An analysis explaining the difference between the 9 with suicide terrorism and the 49 without is lacking.