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I'm currently designing an experiment with several conditions - how do I decide how many repetitions / stimuli within each condition?
I know that I can justify sample size with an a priori power analysis...is there any common way to choose how many trials within each of my conditions?
I was using sample size/power as an example of something where there is a particular approach to help decide.....what I am actually asking about is the number of trials i.e. if I have three conditions in my experiment, how many stimuli should I design for each of the conditions?