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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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Linear Mixed Effects: removing residual outliers

I have a question about how to remove residual outliers in linear mixed-effects models (i.e., data points with standardized residuals exceeding 2.5 standard deviation units). … Should I remove these outliers after fitting the data to the simplest model (i.e., that including only random effects)? …
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