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Power calculations in these cases are straightforward. The amplitude of this ERP at a specified time is calculatedĪnd ANOVA or t test is run on these summary statistics. Typically a mean ERP at some electrode is calculated for each participant in each cell of the design,
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The analysis has been fairly old-fashioned:
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I’m hedging - I think it’s all of them.Įvery case of EEG power calculations I’ve seen, Here, though, is where the big problems lie. (see the bottom of the page for links to reasons why) But only for simple designs You should not do a post-hoc power calculation for the effect you did find in your data This is probably a good time to mention that, despite what your reviewers might say, To see power calculations for papers published in Cortex than elsewhere.ĭraw your own conclusions from this. Not coincidentally, it also seems that you’re much more likely I needn’t go into all the pros and cons (mostly pros) of preregistration here, Sampling plan, and analyses before they run their experiment. In preregistration, researchers have to pin down their design, Preregistration is changing thingsĪ good proportion of papers that do have a priori power calculations This conclusion is also backed up by conversations with real people, in real life,Īnd by a cursory search through the literature.ĮEG studies, by and large, do not report power calculations.Ĭhecked 100 recent ERP studies in the literature,Īnd found that none (none!) included power calculations.
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People agreed.ĮEG studies rarely report power calculations, and we don’t always know how to go about doing them. This is something we’re trying to deal with in my own work,Īnd it turns out it’s a big problem in general. (Tagging #rstats #sips2019 for visibility)- Eoin Travers July 9, 2019 Researchers: has anyone ever *ever* seen power calculations reported for an EEG experiment? I'm not asking for a friend.