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Phase one: Histogram of relative error of sandwich standard errors with each small sample correction (rows: Uncorrected (Uncorr), Kauermann and Carroll (KC), Fay and Graubard (FG), Mancl and DeRouen (MD), Morel, Bokossa, and Neerchal (MBN), and Mackinnon and White (MW)) for an independent and exchangeable working correlation matrix (columns). All scenarios have 18 clusters. Grey dotted lines indicate 0% error and ±10% error.
