Solved – What test to compare three groups with data before and after an intervention

anovarepeated measurest-test

I am writing a proposal for a study. I have 3 groups:

  • Group A- receiving specialized intervention technique
  • Group B- receiving regular intervention
  • Group C- control/receiving no intervention

I want to compare each group's mean on a standardized test pre and post intervention to see if the specialized intervention increased means on the standardized test. What test do I use?

Best Answer

You can use repeated measures ANOVA for this. However, if that feels too advanced, another option would be to get difference scores for each group (i.e., subtract pre from post for each person). Then you can use a simple one-way ANOVA on the three sets of difference scores.

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