HyunhFeldtEpsilon() is a measure of sphericity created by \insertCitegg58;textualsuperb. The original measure was biased and therefore, \insertCitehf76;textualsuperb produced a revised version (note that the 1976 paper contained typos that were uncorrected in SPSS; \insertCitel91;textualsuperb)
a vector of column names indicating the relevant columns on which to compute epsilon. Any other columns are ignored.
returns the Hyunh-Feldt estimate of sphericity epsilon
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