Volunteering Applications and methodology Applied Social Psychology


Data and methods of previous studies



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Data and methods of previous studies

  • Many studies use cross-sectional data, including a limited set of controls.
  • Selection and omitted variables are a huge problem here.
  • Studies using longitudinal panel data have almost all used inadequate regression models.
  • Selection and omitted variables are still a problem here.

Adequate Testing, Please!

  • The conventional ‘change model’ includes a lagged dependent variable Yt-1
  • Halaby (2004, Annual Review of Sociology) shows this is not enough.
  • The Yt-1 does not rule out selection effects.
  • Use fixed effects regression models, eliminating variance between individuals
  • Previous studies have rarely used this.



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