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Repeated measures data occur when more than one measurement is collected on the same unit (e.g. subject). Use this tag for RM-ANOVA together with [anova] tag.

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Can I do a PCA on repeated measures for data reduction?

You could look into Multiple Factor Analysis. This can be implemented in R with FactoMineR. UPDATE: To elaborate, Leann was proposing – however long ago – to conduct a PCA on a dataset with repeated m …
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