APA PsycINFOContains abstracts and bibliographic citations for the contents of thousands of journals. Also includes references to dissertations, media, and books. Coverage: 1887 to present. Updated quarterly.
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Primary Data Methods
Primary Data Methods - U.S. National Library of MedicinePrimary data methods involve collection of original data, ranging from more scientifically rigorous approaches for determining the causal effect of health technologies, such as randomized controlled trials (RCTs), to less rigorous ones, such as case series. These study designs can be described and categorized based on multiple attributes or dimensions, e.g.:
Comparative vs. non-comparative
Separate (i.e., external) control group vs. no separate (i.e., internal) control group
Participants (study populations /groups) defined by a health outcome vs. by having been exposed to, or received or been assigned, an intervention
Prospective vs. retrospective
Interventional vs. observational
Experimental vs. non-experimental
Random assignment vs. non-random assignment of patients to treatment and control groups
Find Data Sets
Statistical Abstract of the United StatesA summary of statistics on the United States social, political, and economy. Majority of the data is over time. The data tables provide source information for further research.