Peter V. Marsden

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Name generators used to measure egocentric networks are complex survey questions that make substantial demands on respondents and interviewers alike. They are therefore vulnerable to interviewer effects, which arise when interviewers administer questions differently in ways that affect responses-in this case, the number of names elicited. Van Tilburg(More)
Many questions about the social organization of medicine and health services involve interdependencies among social actors that may be depicted by networks of relationships. Social network studies have been pursued for some time in social science disciplines, where numerous descriptive methods for analyzing them have been proposed. More recently, interest(More)
BACKGROUND There is debate over the types of physicians who should treat patients with complex chronic medical conditions such as human immunodeficiency virus (HIV) infection. We sought to assess the relationship between specialty training and expertise and the quality of care delivered to patients with HIV infection. METHODS We selected random samples of(More)
BACKGROUND Multi-institution collaborative quality improvement programs are a well-established and broadly applicable quality improvement strategy, but there is little systematic assessment their effectiveness. OBJECTIVE To evaluate the effectiveness of a quality improvement collaborative in improving the quality of care for HIV-infected patients. (More)
OBJECTIVE To determine whether a selected set of indicators can represent a single overall quality construct. DESIGN Cross sectional study of data abstracted during an evaluation of an initiative to improve quality of care for people with HIV. SETTING 69 sites in 30 states. DATA SOURCES Medical records of 9020 patients. MAIN OUTCOME MEASURES(More)
Compared to single-clinician care, care provided by multiple clinicians might result in higher-quality care, especially if some of them have condition-specific expertise and complementary knowledge, skills, and roles. Individual physician continuity, which has been shown to be associated with care quality, necessarily decreases when care is provided by(More)
BACKGROUND Nurse practitioners (NPs) and physician assistants (PAs) are primary care providers for patients with HIV in some clinics, but little is known about the quality of care that they provide. OBJECTIVE To compare the quality of care provided by NPs and PAs with that provided by physicians. DESIGN Cross-sectional analysis. SETTING 68 HIV care(More)
Physicians often rely on colleagues for new information and advice about the care of their patients. Evaluate the network of influential discussions among primary care physicians in a hospital-based academic practice. Survey of physicians about influential discussions with their colleagues regarding women’s health issues. We used social network analysis to(More)