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An outlier is an observation that appears to be unusual or not well described relative to a simple characterization of a dataset. A discomfiting possibility is that these data come from a different population than the one intended to be studied.

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Extreme values affecting mean in regression analysis

Q1: If there are outliers for RT for ** each participant's ** response distribution (rather than the population as a whole), then surely this will affect the regression results, as this involves predicting …
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