Hi David,
I believe this question has appeared before. Please see this design: https://s3-us-west-2.amazonaws.com/andersonwinkler/mailingli .st/design_tim2.ods The original thread was this: https://www.jiscmail.ac.uk/cgi-bin/webadmin?A2=FSL; 8d9efdc.1602 The A, B, C and D would be the 2x2 within subject conditions, and the two groups are then the between-subject final "x2" of your 2x2x2.All the best,AndersonOn 13 June 2018 at 19:02, David Hofmann <[log in to unmask]> wrote:Hi all,I'm trying to run a 2x2x2 ANOVA with one between-subject factor (Controls, patients) and two within-subject factors with 2 levels (pos. feedback/neg. feedback and observation/no observation). The number of subjects in each group is different.I want to calculate the 3 main effects (group, feedback, observation) as well as the 2-way (group x feedback) and 3-way interactions (group x feedback x observation). However, I'm not sure how to create a design matrix for this.Any help appreciated!greetingsDavid
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