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Research Methods: Primary and Secondary

Longitudinal studies

  • 3 things to know
  • Component 2

Overview

Longitudinal study, cohort study and two British birth cohort studies.

What you need to know

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Key term

What is a longitudinal study?

Key term

What is a cohort study?

Numbers

Name two British birth cohort studies.

Questions from this subtopic

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  1. 1

    What is a longitudinal study?

    Model answer

    A longitudinal study follows the same group of people over an extended period, returning to them at intervals. Change within individuals can be traced.

  2. 2

    What is a cohort study?

    Model answer

    A cohort study follows people who share a starting event, usually being born in the same period. The members of the cohort are compared as they age together.

  3. 3

    Name two British birth cohort studies.

    Model answer

    The National Child Development Study follows people born in one week of 1958. The Millennium Cohort Study follows around 19,000 children born between 2000 and 2002.

  4. 4

    What is a panel study?

    Model answer

    A panel study re-interviews the same households repeatedly, whatever the age of their members. Understanding Society has followed a large panel of United Kingdom households since 2009.

  5. 5

    Why can a longitudinal design establish order of events where a snapshot cannot?

    Model answer

    A longitudinal study records which event came first in an individual's life. A single survey shows that two things go together but not which preceded the other.

  6. 6

    What is attrition, and why does it matter?

    Model answer

    Attrition is the loss of participants over the years through death, moving away or refusal. The remaining sample becomes less representative of the original one.

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