![]() In clinical epidemiological research, missing data are seldom MCAR. Missing data are often categorized into the following three types: missing completely at random (MCAR), missing at random (MAR), and missing not at random (MNAR). Individuals with missing data may differ from those with no missing data in terms of the outcome of interest and prognosis in general. ![]() ![]() Alma B Pedersen, 1 Ellen M Mikkelsen, 1 Deirdre Cronin-Fenton, 1 Nickolaj R Kristensen, 1 Tra My Pham, 2 Lars Pedersen, 1 Irene Petersen 1,2ġDepartment of Clinical Epidemiology, Aarhus University Hospital, Aarhus N, Denmark 2Department of Primary Care and Population Health, University College London, London, UKĪbstract: Missing data are ubiquitous in clinical epidemiological research.
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