Patrick Monahan, Ph.D. Associate Professor Division of Biostatistics Department of Medicine Indiana University School of Medicine email: pmonahan@iupui.edu

Education
Ph.D. Educational Measurement and Statistics, minor Biostatistics, University of Iowa, 2002
M.A. Educational Measurement and Statistics, University of Iowa, 1994
B.S. Psychology and Philosophy, Iowa State University, 1985

Research Interests
My research interests are in psychometrics, differential item functioning (DIF), dimensionality assessment, item response theory (IRT), and mental health. I was the principal investigator of a funded NIH-NCI R03 grant to perform simulation studies aimed at improving the methods for detecting DIF and assessing dimensionality in mammography screening belief scales. 

Collaborations
I oversee statistical analyses for the Indiana University (IU) Cancer Prevention and Control program. This program includes investigators from the IU Schools of Nursing and Medicine, and the IU Simon Cancer Center. I am a member of the IU Simon Cancer Center Biostatistics Core. My collaborations in behavioral cancer include a range of randomized controlled studies to increase breast and colorectal cancer screening and improve the quality of life for adolescents and adults living with cancer. Several of these studies have focused on under-served populations. I also collaborate with investigators in psychiatry and psychology. My work in depression has spanned different populations: (1) men with prostate cancer, (2) adults living with HIV/AIDS in Kenya (as part of the internationally recognized AMPATH partnership between medical schools at IU and Moi University in Eldorat Kenya), and (3) children at high risk for developing bipolar disorder.

Email address: pmonahan@iupui.edu

Dissertation Correction: In my dissertation (pp. 195-197), I mistakenly conjectured that the minor Type I error deflation under simulated identical proficiency distributions was possibly due to inclusion of the studied item in the matching score, but in fact the real reason for the deflation is the continuity correction in the Mantel-Haenszel (MH) chi-square as described by Holland and Thayer (1988) in their seminal article on DIF and the MH procedure.

In an article in press, “Reliability and Validity of an Instrument for Assessing Patients’ Perceptions about Medications for Diabetes: The PAM-D”, there is a citation for a conference paper by McHorney et al., which is available here: McHorney et al ISPOR 2004.pdf