Longitudinal studies — advantages, disadvantages, examples
Longitudinal studies follow same participants over time (months, years, decades), showing change and causation. Examples: NCDS, Millennium Cohort Study.
Real World
The Millennium Cohort Study tracked over 19,000 children born in 2000–2001 across the UK, revealing that children eligible for free school meals had significantly lower educational attainment at every measured stage.
Exam Focus
Always evaluate longitudinal studies by addressing attrition — state clearly how sample dropout threatens representativeness and validity of findings.
How well did you know this?