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LONGITUDINAL

Strengths

  • Gathers rich, detailed data
  • Shows trends over time
  • Removes participant variables (because the participants stay the same)
  • High ecological validity (set in the real world)
  • Explores developmental changes

Weaknesses

  • Time consuming, therefore expensive
  • Sample attrition - often the most interesting participants drop out
  • Experimenter bias - tendency to get close to the participants
  • Ethical issues - can put pressure on participants or influence their life choices

CROSS-SECTIONAL STUDIES

Strengths

  • Quick, easy, therefore cheap
  • No sample attrition
  • Avoids ethical pressure or experimenter intimacy

Weaknesses

  • Cohort effects - some groups at a particular stage are untypical
  • Unreliability - snapshot on a particular day may be unrepresentative
  • Superficial - no depth to the data
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12y ago

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