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Research Methods: Primary and Secondary

Longitudinal studies

  • 3 things to know
  • AS Unit 2 and A2 Unit 4

Overview

Longitudinal study, cohort study and sample attrition.

What you need to know

Answer each one before you reveal it.

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Key term

What is a longitudinal study?

Key term

What is a cohort study?

Key term

Explain how a longitudinal study can distinguish an age effect from a generational effect.

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    What is a longitudinal study?

    Model answer

    A study that follows the same group of people over an extended period, collecting data from them repeatedly.

  2. 2

    What is a cohort study?

    Model answer

    A longitudinal study of a group who share a defining characteristic, most often being born in the same period.

  3. 3

    Give one advantage of longitudinal research over a cross-sectional survey.

    Model answer

    It shows how the same people change over time, so cause and effect can be traced in sequence rather than inferred from one snapshot.

  4. 4

    Explain how a longitudinal study can distinguish an age effect from a generational effect.

    Model answer

    Because the same people are followed as they age, changes in them can be separated from differences between one generation and another.

  5. 5

    What is sample attrition?

    Model answer

    The loss of participants from a study over time through death, relocation or refusal to continue.

  6. 6

    Explain why attrition threatens the representativeness of a longitudinal study.

    Model answer

    Those who drop out often differ systematically from those who stay, so the surviving sample no longer matches the original population.

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