Jeromy Anglim's Blog: Psychology and Statistics

Wednesday, September 9, 2009

Experiments with a mixture of repeated measures and between subjects factors

I often speak to researchers who need to analyse an experiment with a combination of between subjects and repeated measures factors.
Some Examples:
  • 5 x 3 Design: 5 levels of task type (repeated measures); and 3 levels of group (between subjects)
  • 2 x 2 x 2 Design: 2 levels of order (between subjects); by 2 levels of instructions (between subjects); by 2 levels of task feature (repeated measures)
This post directs such researchers to some resources on the web.

  • UCLA has several examples of how examine such designs using SPSS Repeated Measures ANOVA; It also talks about how to test contrasts and run follow up test more generally.
  • Andy Field provides a gentle introduction to repeated measures ANOVA using SPSS.

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