Understanding the factors contributing to a student's ability to persist toward graduation is paramount to the success of an institution's doctoral program. This study explored specific psychological factors (psychological capital) as they relate to persistence factors for doctoral students. Additionally, this study expands upon the research and literature on psychological capital using an established instrument, Compound Psychological Capital scale (CPC-12), in a new context. Finally, this study expands the research and literature on doctoral student persistence by applying the College Persistence Questionnaire (CPQ), designed for undergraduate students, to the doctoral student population. A quantitative, cross-sectional research design was used to examine the relationship between variables using statistical analyses such as one-way ANOVA and multiple regression. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://www.proquest.com/en-US/products/dissertations/individuals.shtml.]