This is probably going to seem silly, but I'm wondering which method of ANOVA to use in SPSS.
I've carried out an experiment that contains two treatments (control vs. treatment). Subjects are presented with two apples in each condition that they must evaluate. For example, Control: Big Apple (2oz) & Little Apple (1oz). Treatment: Big Apple (2oz) & Ladies Apple (1oz).
The idea is that both men and women will evaluate the control apples the same (2oz and 1oz). In the treatment, men will negatively evaluate the ladies apple (1oz).
I'm looking for a three-way interaction (at least I expect one). Would I be right in thinking I use SPSS like so:
Analyze > General Linear Model > Repeated Measures
Within-subjects factor: Apple_Size (2 levels)
Measure Name: Apple_Evaluation
Between Subjects Factor: Gender (2 levels) and Condition (2 levels)
I've added a screengrab of the SPSS Repeated Measures box.
I've searched everywhere regarding Three-Way Factorial ANOVAs but none seem to discuss having two between-subjects, but instead two within-subjects.
Hi Ross,
seems correct to me! Have a look at Howell (2013) - Statistical Methods for Psychology, in chapter 14, p 478 he describes the design for two between and one within IV (but not with SPSS). Additionally, you should have a look at Tabachnick & Fidell (2007) - Experimental Design Using ANOVA (not the famous multivariate statistics book from the authors). Chapter 7 covers split-plot designs and 7.7 (p. 355) gives an complete example with SPSS of a 3x2x2 design with 2 between and one within factor.
Good luck.
Hi Rainer,
You're a life saver, thank you! I've found the Howell book that you recommended, so I can close the 50+ tabs on my browser that were of no use at all.
I've just found a 2x2x2 design on p310 of Designing Experiments and Analyzing Data (Maxwell & Delaney, 1990), so if you're ever asked again you can point them to that too.
Thanks again!
Glad I could help and thanks for the Maxwell and Delaney reference.
Best,
Rainer
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