Calculate the aggregated error term from an aov object
An object of class aov representing an ANOVA calculation
(vector) A character vector of
the names of the error terms to combine. Note that these
are the names embedded in the aov summary. It may be
best to extract them from a use of the
Rosenthal & Rosnow. (2008). Essentials of Behavioral Research. Boston: Mc Graw Hill.
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