How attrition impacts the internal and external validity of longitudinal research

J Sch Health. 2005 Sep;75(7):267-70. doi: 10.1111/j.1746-1561.2005.00035.x.
No abstract available

MeSH terms

  • Health Education*
  • Humans
  • Longitudinal Studies*
  • Reproducibility of Results*
  • Research / standards*
  • Sample Size
  • Selection Bias*