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Clustered standard errors represent the version of the general sandwich variance estimator that correct for (potential) grouping of the observations, e.g., repeated measurements clustered within an individual, or individuals clustered within a hierarchy level (geographical region, educational institution, etc.).
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Replicate Stata 'variance' and 'robust' in R for mixed effects methods [closed]
I am working with a small dataset of clustered data. The experiment is on mice, testing the efficacy of a substance for neurons cells within mice, and delivery of a fatty acid substance between mice. …