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  2. Nested case–control study - Wikipedia

    en.wikipedia.org/wiki/Nested_case–control_study

    Case–cohort study. A case–cohort study is a design in which cases and controls are drawn from within a prospective study. All cases who developed the outcome of interest during the follow-up are selected and compared with a random sample of the cohort. This randomly selected control sample could, by chance, include some cases.

  3. Case–control study - Wikipedia

    en.wikipedia.org/wiki/Case–control_study

    A case–control study (also known as case–referent study) is a type of observational study in which two existing groups differing in outcome are identified and compared on the basis of some supposed causal attribute. Case–control studies are often used to identify factors that may contribute to a medical condition by comparing subjects who ...

  4. Descriptive statistics - Wikipedia

    en.wikipedia.org/wiki/Descriptive_statistics

    v. t. e. A descriptive statistic (in the count noun sense) is a summary statistic that quantitatively describes or summarizes features from a collection of information, [ 1] while descriptive statistics (in the mass noun sense) is the process of using and analysing those statistics. Descriptive statistics is distinguished from inferential ...

  5. List of medical ethics cases - Wikipedia

    en.wikipedia.org/wiki/List_of_medical_ethics_cases

    Psychosurgery. 1880s. Psychosurgery (also called neurosurgery for mental disorder) has a long history. During the 1960s and 1970s, it became the subject of increasing public concern and debate, culminating in the US with congressional hearings. Particularly controversial was the work of Harvard neurosurgeon Vernon Mark and psychiatrist Frank ...

  6. Inclusion and exclusion criteria - Wikipedia

    en.wikipedia.org/wiki/Inclusion_and_exclusion...

    Exclusion criteria concern properties of the study sample, defining reasons for which patients from the target population are to be excluded from the current study sample. Typical exclusion criteria are defined for either ethical reasons (e.g., children, pregnant women, patients with psychological illnesses, patients who are not able or willing ...

  7. Research design - Wikipedia

    en.wikipedia.org/wiki/Research_design

    A research design typically outlines the theories and models underlying a project; the research question (s) of a project; a strategy for gathering data and information; and a strategy for producing answers from the data. [ 1] A strong research design yields valid answers to research questions while weak designs yield unreliable, imprecise or ...

  8. Cohort study - Wikipedia

    en.wikipedia.org/wiki/Cohort_study

    A cohort study is a particular form of longitudinal study that samples a cohort (a group of people who share a defining characteristic, typically those who experienced a common event in a selected period, such as birth or graduation), performing a cross-section at intervals through time. It is a type of panel study where the individuals in the ...

  9. Case series - Wikipedia

    en.wikipedia.org/wiki/Case_series

    A case series (also known as a clinical series) is a type of medical research study that tracks subjects with a known exposure, such as patients who have received a similar treatment, [ 1] or examines their medical records for exposure and outcome. Case series may be consecutive[ 2] or non-consecutive, [ 3] depending on whether all cases ...

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