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Applied Research Methods

Additional Methodologies (Unit 4): longitudinal studies and cross-sectional studies

  • 3 things to know
  • A2 Unit 4

Overview

Longitudinal and cross-sectional designs applied to questions such as vocabulary growth, attrition and the cohort effect, practical and ethical issues, and which design controls for participant variables.

What you need to know

Answer each one before you reveal it.

Your recallNot started
Study

What is attrition, and why does it threaten a longitudinal study?

Key term

How would the same vocabulary question be tackled cross-sectionally?

Evaluation

State the main advantage a longitudinal design has over a cross-sectional one.

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    What is a longitudinal study?

    Model answer

    It is a study in which the same participants are followed and measured repeatedly over an extended period, often years, to see how they change.

  2. 2

    What is a cross-sectional study?

    Model answer

    It is a study in which different groups, usually of different ages, are compared with one another at a single point in time.

  3. 3

    A researcher wants to know how vocabulary develops between the ages of 4 and 11. Describe how this could be investigated longitudinally.

    Model answer

    A single group of four-year-olds would be recruited and their vocabulary measured at intervals as they grew up, with the same children retested each time until they reached eleven.

  4. 4

    How would the same vocabulary question be tackled cross-sectionally?

    Model answer

    Separate groups of four-, seven- and eleven-year-olds would be given the same vocabulary measure at the same time and their scores compared.

  5. 5

    State the main advantage a longitudinal design has over a cross-sectional one.

    Model answer

    Each participant serves as their own baseline, so any change found cannot be explained away by individual differences between the people making up each group.

  6. 6

    What is attrition, and why does it threaten a longitudinal study?

    Model answer

    Attrition is the loss of participants during the course of the study, and it is a threat because those who remain may differ systematically from those who leave, so the sample left at the end is biased.

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